PRS MEANING EXAMPLE WORDS

A
Select another letter.

a- without, not, no abiotic, asexual, asymmetry, atrophy, aphasia,
acentric, atheist, agnostic, amoral, apathy, apod
ab- from, away from abduction, abstinence, abirritant, abjure, absorb
down, down from ablution, abscond, abstract, absent, aberrant
abdomin- abdomen abdominal
-able capable of being, flammable, edible, trainable, charitable,
can do illuminable, usable, notable
ac- sharp acupuncture, acrid, acute, acnode,
acrimonious
-ac pertaining to hypochondriac, maniac, kleptomaniac, pyromaniac
aca- thorny, spiny, nettle, point acaleph, acanaceous, acanthus, acanthoid
-acea class or order name Crustacea, Cetacea
-aceous of the nature of herbaceous, sebaceous
acet- acid, vinegar acetic acid, acerbic, acetabulum
-acious inclined to be spacious, fugacious
acou- hearing acoumeter, acoustics, acoustician
acr(o)- high, up, hill, topmost acrobat, acrodont, acromegaly, acropolis
actin- light ray, beam actiniform, actinic, actinozonal, actinolite
acu- sharp, needl acupuncture, acute, acumen
-acy state of being lunacy, piracy, dormancy, legacy
ad- attached to, near, increase adhere, adductor, adrenal, addict
-ad toward, in the direction of cephalad, cycad, triad, monad
-ade result of action marmalade, lemonade
aden(o)- gland adenoid, adenoma, adenectomy
adip(o)- fat (animal) adipose tissue, adipoma, adipocere
adren- adrenal adrenal gland
aer(o)- air, atmosphere, gas aerobic, aeronautics, aerodynamics,
aeroscope, aeriferous, aerial, aerodrome
aesth- feeling, understanding aesthete, aesthesiometer
af- to, towards afferent
-age act of, state of, heritage, breakage, plumage, sewage, blockage,
collection of, mass marriage
agglutin- to glue together agglutinate
-agogy leading pedagogy, demagogy
agora- open spaces agoraphobia
-agra violent or sharp pain podagra
agr(o)- crops, field, soil agronomy, agroclimatology, agriculture
-al pertaining to, act, cranial, skeletal, mental, internal, humoral,
process of, or relating to pectoral, medial, abdominal, nominal, focal
alb(u)- white albumin, albino, albatross, albedo,
-algia pain causalgia, neuralagia, cardialgia, myalgia
alim- food, to nourish alimentary, aliment
-ality property of, condition of sexuality, proportionality, reality
allele of one another allele frequency, multiple alleles
allo- other, different alloy, allocate, allogamy
alt(o)- high altitude, altimeter, altocumulus, altisonant
alter- another alternate, alter-ego
alveo- cavity, channel alveolus, alveolar cavity, alveolate
am- love amorous, amateur
ambi- on both sides, around ambidextrous, ambivalent, ambiguous
ambly- dull, dim, obtuse, blunt amblyopia, amblygonite, amblyoform
ambu(l)- walk ambulatory, ambulate, ambulance, amble,
amphi- both, on both sides, in amphibian, amphiblastula, amphitheater,
two ways, double, doubly amphipod, amphipneustic
ampli- large, to increase ample, amplify, amplitude, amplicative
amyl- starch amylase, amylopsin
an- without, not, no, negative anaerobic, anarchy, aneroid, ananthous,
anhydrous, anonymous, anemia
-an pertaining to, of, resembling brachyuran, hydrozoan, American
ana- up, again, apart, backward anaphase, analogy, anabolic steroid
-ance the act of, a thing that continuance, annoyance, nuisance, dominance,
inheritance, substance
andr(o)- male, masculine, man androgen, android, androspore, androgny
ane- without feeling anesthetic, anesthesia, anesthesiology
-ane attribute humane, urbane, mundane, arcane, Germane
angina- pain, torture angina pectoris, anginoid, anginal
angio- vessel, closed, cased angioplasty, angiogram, angioblast, angiosperm
anim- soul, breath, spirit animal, animate, animaculum
anis- unequal anisocytosis, aniseikonia, ansiometric
ankyl- crooked, bent, stiff ankylosis, ankylosaur,
annel- year, ringed, segmented annual, annelid, anniversary, annuity
-ant that has, shows or does merchant, covenant, servant, pleasant
ante- before, in front of antedate, anteflexion, anterior, anteroom, antebellum
anter- before, front, in front antenatal, antemortem, antechamber, antecedent
anth- flower antheridium, anther, antherozoid, ananthous
-anthropo- man, human, referring to man anthropology, anthropoid, philanthropy
ant(i)- against antitoxin, antibody, antigen, antidote, antiaircraft
antiq- ancient antique, antiquary, antiquate, antiquity
aper- open aperient, apert, aperture, aperitif
api- top apex, apical, apiculate
apo- detached, away from, off apocrine gland, aponeurosis, apogee, apospory
append- hang on, addition appendage, appendix, appendicle
appet- to seek appetitive, appetite, appetency
aqua- water aqueous, aquifer, aquarium, aquaculture
-ar pertaining to, like, relating to polar, scholar, cellular, stellar, molecular
arbor- tree arboreal, arboretum, arborescent
arch- primitive, original, ancient archenteron, Archaebacteria, archive
-arch ruler, leader monarch, tetrarch
-archy rule, leadership gynarchy, anarchy
archeo- beginning archegonium, archeology
-arian age, sect, occupation librarian, utilitarian, vegetarian, valedictorian
-arium place for oceanarium, terrarium, aquarium, sanitarium, solarium
-ard one who carries an action drunkard
arterio- reguarding arteries arteriosclerosis
arthr(o)- joint, jointed arthropod, arthritis, arthrology, arthroscope
articul- joint articulation, articulate, articulator
-ary pertaining to, place for, imaginary, illusionary, aviary, boundary,
connected with bacillary
asc- sac, bag asci, ascomycete, ascocarp, ascospore
-ase enzyme lipase, sucrase, amylase
-asis condition or state of metastasis, homeostasis
aster- star like, star aster rays, asteroidean, astronomy, astronaut
-asthenia loss of strength, weakness neurasthenia, myasthenia gravis, asthenia gravis
-ate to cause, like, having, owing nervate, laminate, acidulate, oxygenate
-ate chemical compound acetate, aluminate, carbonate
-atic of the kind of plasmatic, somatic
-ation that act of, condition of, speciation, condensation, precipitation, migration
state or concept of, process filtration, oscilation, concentration
atmo- breath, breathe, vapor atmosphere, atmometer, atmolysis
-atory characterized by, of or circulatory, respiratory, ambulatory,
relating to conservatory, laboratory, observatory
audi- hear, hearing audio, auditory, audible, auditorium, audiance, audition
auri- ear auricle, auricular, aurilave
auto- self, same autonomic, automatic, autosome, autotroph, autonomy
autoimmune, autobiography, automobile, autograph
aux- grow auxin, auxiliary, auxospore
avi(s)- bird avian, aviary, aviation, aviator
axi- axis, turn axle, axil, axillary, axilla

PRS MEANING EXAMPLE WORDS

B
Select another letter.

bac- rod, stick bacteria, Bacillus, bacteriophage
bar- pressure, weight, heavy barometer, barograph, barium, baritone
bas- base basal disc, basidia, basilar
bathos- deep, depths underwater bathysphere, bathymeter, batholith
be- completely, excessively bemuse, bespeak, bewail, besmirch
ben- well benign, benediction, beneficial, benefactor, benefit
bentho- depths (of the sea) benthic, benthos, benthal
bi- two, twice, double binocular, bilateral, bipedal, bipinnate,
bivalve, binocular vision, biennial, binary
bio- life, related to life, living biology, biotic, biogenesis, biopsy, biochemistry
-biosis mode of living symbiosis, abiosis, parabiosis
-blast(o)- embryo form, bud, germ blastula, osteoblast, blastopore, blastoderm
that which will generate blastocyst, blastomere
blepharo- eyelid blepharospasm, blepharoplast, blepharism, blepharadenitis
-boli- ball, throw bolide, catabolism, metabolism
bot- graze, feed, plants botany, botanical, botanist
brachi- arm brachial, brachiocephalic, embrace
brady- slow bradycardia
-branchi- gill branchiomorph, branchiopod
brevi- short brief, brevilineal, brevity
brom(o)- stench bromine, bromide
bronch- windpipe, trachea bronchitis, bronchial, bronchoscope
bry- moss, grow bryology, bryophyte, bryozoan
bucc- cheek buccal, buccinator, buccolingual
bulla- of lead bullet, bullitin
bunio- hill, rounded bunion, bunodont, buninoid
-bursa- purse, pouch bursae, bursitis, bursiform, reimburse, disburse

PRS MEANING EXAMPLE WORDS

C
Select another letter.

cac(o)- bad cacophony, cacography
calcane- heel calcaneous
calc(i)- lime, chalk calcium, calcite, calcification, calcify
calcu- to reckon, pebble calculator, calculate, calculus
calo(r)- heat calorie, caloreceptor, calorescence, calorimeter
calyp- husk, cover calyx, calypteron, calyptrogen
cand- white, bright candle, candescent, candent
capilli- hair capillary, capillarity
capit- head decapitate, capitate bone
carcin- cancer, a spreading sore carcinogen, carcinoma, carcinization, carcinogenesis
cardi(o)- heart cardiogram, cardiology, endocarditis, tachycardia
cari- decay carrion
carn(i)- flesh carnivore, carnivorous, carnelian, carnage
carp- fruit carpology, carpogonium, carpophore
carp- wrist (carpus) carpal
caryo- nucleus eukaryote, prokaryote
cast- to make pure castigate, caste,
cata- down, under, lower, catabolism, catalyst, catatonia, catastrophe,
decomposition, against catatonic, cataclysm
cathar- pure, purge catheter, catharsis, catharist
caud- tail caudal fin, acaudal, caudate
cauli- stem cauliflower, caulescent, caulicle
-caus- to burn caustic, holocaust, cauterize, causalgia
cav- hollow cave, concave, cavern, caval, cavity
caval- horse cavalier, cavalry, cavalcade
cec- blind cecum
cede- go, yield proceed, precede, exceed, succeed, concede, recede
ceil- heaven ceiling, celestial
-cele hernia, tumor, pouching cystocele, hydatidocele
celi- belly, abdomen celiac, celiac artery
cell small room cell, cellular, cellar, cellarette
ceno- empty cenotaph, cenosis, cenotron
ceno- new, common cenozoic, cenobite, cenosere
cens- to judge censorial, censor, censure
-cent- hundred, hundredth part centigrade, century, centimeter, percent, centipede
-centesis puncturing amniocentesis, rachicentesis, cardiocentesis
-centr- round, middle eccentric, centromere, ethnocentric
centro- center centromere, centriole, centrosome, centrifuse,
centripetal, cenrifugal
-cephal(o)- head, upward, up cephalic, cephalothorax, hydrocephalus, anencephaly,
cephalization, cephalometry, marocephaly, cephalopod
-ceps head biceps, triceps
-cept to take reception, intercept, percept, concept
cereb- brain cerebellum, cerebrum, cerebral
cervi- neck cervical collar, cervix
chaeta bristles chaetopod, Polychaeta, chaetognath
cheli claw cheliped, chelicerata, chelicera, cheliform, chelate
chemo- chemical, drug chemosynthesis, chemotherapy, chemotaxis,
chemoreceptor, chemotropism
chiasm- a cross optic chiasm, chiasmata
chir- hand chiroptera, chiropody
chlor(o)- green, containing chloride chlorophyll, chlorine, chloroplast
chol- bile, gall cholesterol, cholera, cholinesterase, cholecyst
chondr- cartilage, small hypochondria, mitochondria, chondrocyte,
grainlike structure Chondrichthyes
-chord- cord, string chordata, notochord, chordate
choroid- skin like choroid coat, choroidoiritis
chrom(o)- color, colored chromosome, chromatography, chromatin, achromic
chron(o)- time chronic, chronological, anachronism, chronology
chrys(o)- golden chrysophyte, chrysochlor, chrysalis, chrysaniline
chym- juice chyme, parenchyma, sclerenchyma, chymosin
-cian having a certain skill physician, clinician, technician
-cide kill, killer, killing insecticide, homicide, herbicide, pesticide, suicide
fratricide, genocide, vespacide, regicide
cilia- little hairs cilium, ciliata, ciliograde
cine- movement cinema, cinematic, cinemascope
circum- around, about circadian, circumference, circumnavigate, circumvent,
circumstance, circulatory, circumcision, circus
cirrh- orange-yellow cirrhosis
cis(e)- cut incise, incision, scissors, circumcision, incisor, excision
-city practice atrocity
class- clan, in common classify, classification, classmate
-clast dissolving, broken osteoclast, iconoclast, orthoclase, plagioclastic, osteoclasia
claust- confined spaces claustrophobia, closet, clausura
clav- key, club clavicle, clavate, clavichord
clima- region, slope climate, climax, climacteric
-cline- to learn incline, recline, clinograph
-clude- closing conclude, occlusion, preclude, include, exclude, seclude
cnid(e)- nettle cnidoblast, cnidophore, cnidocil
co- with, together coed, coevolution, cohesion, cohabitate,
codominance, cohere, cooperate
coagu- curdle, gel coagulate, coagulin
cocc- berry coccus, coccidious, streptococcus, coccidium
-coch- snail cochlea, cochleant, cochleate
-coel(e)- hollow, cavity, chamber coelom, blastocoel, pseudocoelom, hemocoel, mucocoel
-cogni- to know recognize, cognizant,cognoscent,incognito,recognizance coleo- sheath, shield coleophyl, coleoptrera, coleorhiza
collo- gelatin, glue collodion, colloid, collodium
colo- colon colostomy, colitis
colpo- vagina colpospasm, colposcopy
com- together composite, complex, combine, community, complicate
con- with, together conclude, conjoin, connect, congress, connotation
condyl- knob, knuckle condyle, condyloma
coni- dust conidium, conidiophore, conidial
conjunct- join together conjunctiva, conjuctivitis, conjuction
cono- cone conoid, conoscope, conodont
consider with stars consideration, considerate, considerable
contra- against, opposed to contrary, contradict, contraception, contraband
-copia- abundance copious, copiously, cornucopia
copr- feces, excrement, dung coprolite, coprolallia, coprophagous
core- pupil corectopia
cornu- horn cornea, cornu, cornucopia
corona- a ring corona, coronagraph, corrola, coronary, coroniform
corpus- body corpus luteum, corpuscles, corpse, corporation
corro- together-gnaw corrode, corrosive, corrodent
cortic- cortex, bark, rind corticotropin, corticobulbar, corticate, cortin
cosm- universe cosmic, cosmonaut, cosmopolitan, cosmology
-cost- rib intercostal, costalgia
-cotyl- cup cotyledon, monocotyledon, dicotyledon
counter- against, opposite counterpoint, counterfeit, counter-clockwise
-cracy rule, form of government democracy, autocracy, aristrocracy, meritocracy
cran- skull, head, brain cranium, cranial, craniotomy
-crat a supporter of, rule democrat, autocrat, aristrocrat, bureacrat
cred- to believe credible, credit, incredible, credulous
-crin- secrete, cry endocrine, endocrinology
-crit separate hematocrit
cruci- cross cruciform, cruciate, excruciate, crucial ligament, crucify
crusta- shell, tough hard surface crustacean, cruataceous, crustal
cry(o)- extreme cold, frost cryonics, cryogenics, cryosurgery, cryophyte, cryostorage
crypt- hidden, concealed cryptic, cryptogram, cryptorchism, cryptozoology
culp- fault culprit, culpable
-cubo- lie in or on incubate, incubus, incubator
cumu- pile, heap accumulate, cumulus, cumulative, cumulonimbus
curs- run cursorial, cursive, cursory, precursor, cursor
cusp- a point cuspid, bicuspid, cusped,
cuti- skin cuticle, cutin, subcutaneous, cutaneous respiration
-cy action, function, condition pregnancy, deficiency, impotency, agency, idiocy
cyano- blue, blue green cyanic, cyanosis, cyanide, cyanobacteria
-cycl- round, circle, wheel cycle, epicycle, hydrocycle, cyclone, cyclic, bicycle
-cyst- bladder, sac, pouch cystitis, trichocyst, cystectomy, cystine, cystocele
-cyt(o/e)- cell, hollow vessel erythrocyte, leukocyte, lymphocyte, osteocyte, cytology,
cytokinesis, cytolysis, cytoplasm, cytoblast, cytochemistry,
cytosis, osteocyte, cytosol, exocytosis, endocytosis

PRS MEANING EXAMPLE WORDS

D
Select another letter.

dactyl- finger, toe, digit polydactyl, dactylogram, pterodactyl
de- from, away, down, to decompose, denature, degenerate, detach, deploy,
do the opposite, undoing devoid, deodorize, dehydrate, deoxyribose,
or removal of detoxification, depolarization, desalination
dec(a)- ten, tenth decade, decagon, December
deci- one-tenth decimal, decimeter
deci- falling off, falling out deciduous, decimate, decimate, decidua
-dem- people demographics, democracy, epidemic, demagogue
dendr(o)- tree, branching dendrite, dendrology, dendriform, dendrolith
dent- tooth dentist, Endentata, dentition, denticulate
-derm- skin, covering, tissue layer epidermis, dermal, hypodermic, echinoderm, ectoderm,
dermatologist, dermatitis, endoderm, mesoderm
deut- second deutoplasm, duet, Deuteronomy, deuthyalosome
dextr- right dextrose, dexterity, dextrorotatory, dextroposition,
di- twofold, double, twice disaccharide, dihybrid, diatom, diatomic, dichromate,
dicotyledon, dichotomy, dichotomous key
di- apart digress, diverge, diastyle, dioecious
di- day diurnal
dia- through, across, between diagonal, diagnosis, diameter, diarrhea, dialysis, diaphragm
dict- to say, speak diction, dictate, contradict, indict, predict, verdict, dictum
dilu- wash apart dilute, dilution, dilutent, diluvial
dis- undo, apart, away dissolve, dismiss, disperse, disconnect, disarray, dissent
divi- cut, apart divide, division, dividend, divider
-dom state of being, realm freedom, kingdom, wisdom, stardom
-dont- tooth orthodontist, coelodont, lophodont, periodontitis
dorm- sleep dormant, dormancy, dormitory
dors- back dorsiflexion, dorsal, dorsolateral
dox- view, teaching doxology, orthodox,
-drome race course, running palindrome, airdrome, hippodrome, velodrome
-duct- carry, to lead conduct, aqueduct, abduct, product, deduct, viaduct
-dura- hard dura mater, durable, endure, epidural, subdural
dyn(a)- force, power dynamite, dynamic, dynamo, dynasty
dys- bad, ill, painful, difficult, dysentery, dysfunction, dystrophy, dyslexia, dysplasia,
deformed, abnormal dyspnea, dysuria, dysmenorrhea, dystaxia

PRS MEANING EXAMPLE WORDS

E
Select another letter.

e(c)- out of, from, exclude emit, edict, elude, erupt, eccentric, ectopic
-ee one who receives action employee, trainee
echino- spiny, prickly echinoderm, echinate, echinus, echinoieda
eco(s)- house ecology, ecosystem, economy, ecotage, ecotone
ech- sound echolocation, echogram, echochamber, echocardiography
ecto- outer, outside, external ectoderm, ectoplasm, ectoparasite, ectomorph
-ectomy cut out, excision appendectomy, tonsillectomy, vasectomy, spleenectomy
effu- pour forth effulence, effulent, effluvium, efflux, effuse, effusion
ego- self egotist, egotistic, egoism
elast- return to shape elastic, elasticity, elastance
electr(o)- electrical, electricity electrocardiogram, gel-electrophoresis, electrocution
embol(i)- a stopper, ball embolism, embolic, embolus, embolectomy
embryo swelling inside embryo, embryology, embryonic, embryosis, embryogenesis
-emia blood condition anemia, toxemia, leukemia, hyperglycemia
-en cause to be, made of harden, lessen, darken, sunken, swollen
en- in, into, within endemic, encephalitis, entangle, enrobe, endear
-ence action, process, state emergence, science, bioluminescence, fluorescence
-enchyma tissue parenchyma, collenchyma, sclerenchyma, mesenchyma
end(o)- inner, inside, within, endoderm, endoskeleton, endothermic, endoscope, endoblast
internal, in endosperm, endopodite, endoplasm, endocrine, endotoxin
-ene ending for alkenes ethylene, methylene, phenylthalene propene
entero- intestine, gut coelenterate, enteritis, enterostomy, enterobiasis
eo- early, most primitive Eozoan, eohippus, eolithic, eocene
epheme- brief, lasting one day ephemeron, ephemeral, Ephemeridae
epi- over, upon, outer, above, epidermis, epigenesis, epiphyte, epiglottis,
attached to epidemic, epitaph, epicenter, episode
episi- vulva episiotomy
equ- equal equate, equator, equation, equidistant, equilibrium
-er one who, more teacher, lawyer, preacher, brighter, lighter, writer
-erg(y)- work energy, synergist, ergometer, ergograph, synergy, ergal
-erythr(o)- red erythrocyte, phycoerythrin, erythromycin
eso- inside, will bear esophagus, esophoria, esostamenous
-esthesia feeling, sensation synesthesia, kinesthesia, anesthesia
estiv- summer estivation, estival, estivate
estr- female estrogen
ethi- character ethics, ethos, ethically, ethicize
ethno- race, nation ethnic, ethnicity, ethnology, ethnocentric
eti- cause etiology, etiolate
eu- good, well, normal, true, eukaryote, eubacteria, eugenics, euphoria
most typical euthanasia, eulogy, euphemism, eucoelom
eury- wide eurypterid, aneurism, eurycephalic
ex- from, out of, former expel, excretion, exit, extinction, exodus, ex-president
exo- outside, outer, external exoskeleton, exothermic, exopathic, exorhiza, exopodite
exter- outside external, extrinsic, exterior
extra- outside, in addition, beyond extracellular, extracurricular, extraterrestrial, extraneous

PRS MEANING EXAMPLE WORDS

F
Select another letter.

faci- make (easy) facile, facilitate, fascimile
fasc- a bundle fascia, fascine, fascist
febri- fever febrifuge, febricity, febrile
feli- happy felicitate, felicity, felicific
felis cat felidae, feline, felineness, Felis domesticus
fels- rock felsic, felsite, feldspar
-fer to carry or bear transfer, conifer, aquifer, ferry
fera wild feral, ferocious, fierce
-ferous bearing coniferous, auriferous, sporiferous
fibr- fiber, hair like fibrin, fibroblast, fibrinogen
-fic making, causing scientific, terrific
-fido- faithful, trustful fidelity, infidelity, fiduciary
filo- thread filament, filarial, filopodium
fissi- split, cleft fission, fissure, fissile, fissate
flatu- blow, break wind flatus, flatulate, flatulence, deflate, inflate
-flect turn or bend reflect, deflect, inflect, reflection
-flex- bend flexion, flexor, reflex, flexible, circumflex
-flict- to strike conflict, inflict, infliction
flor- flower, bloom florist, floret, florescence
-flu(x)- flow effluence, influence, fluctuate, confluence, reflux, influx
fluor- glow with color fluoresce, fluorescence, fluoroscope, fluorescein
-foli(o)- plant, leaves folio, foliage, foliate, foliolate, exfoliate, trifoliate
folli- bag, sack follicle, follicular, folliculated
forami- opening, hole foramen, foraminate, foramen magnum
fore- before, in front of foreskin, foreshadowing, forecast, forefoot, forefinger
-form- shape formula, vermiform, fusiform, formidable
fossa- dig, trench fossil, fossorial, fossilize, fossorial, fossil fuel
fov- pit fovea, foveola, foveiform, fovea centralis
-fract- broken fracture, infraction, fraction, refraction
fragi- delicate, frail fragile, fragment, fragmental, fragmentate, fragmentation
frat- brother, sibling fraternal, fraternity, fraternize
fric- rub, carve frets, fretful, friction, fricative, fricassee
frigi- be cold frigid, refrigerate, frigidity, frigorific
fruc- fruit fructose, fructuous, fructuform
-fug(e)- to drive out, to flee centrifuge, fugitive, fugacious
-ful full of, having much hopeful, useful, thankful, colorful, fruitful, respectful
fuma- smoke, fumes fumigate, fuming, fumarole
fund- bottom, deep fundus, fundamental, fundament
fung- mushroom, toadstool fungus, Fungi, fungal, fungicide
funic- small rope funicular, funiculus, funiculate
furi- to rave, insane furor, fury, infuriate, furious
fuse- to melt, pour together fuse, fusion, fusible, infusible, infusion, transfusion, confusion
-fy make, cause, cause to petrify, simplify, signify, purify, exemplify

PRS MEANING EXAMPLE WORDS

G
Select another letter.

gala- milk-white galaxy, galactagog, galactic
gamet- sexual, reproductive gamete, gametophyte, gametogenesis, gametocyte
gam(o)- united gamogenesis, gamotropic, gamosepalous
-gamy marriage bigamy, monogamy, cryptogamy
gangli- a swelling, knot, tumor ganglia, ganglion, gangliated, ganglionic
gastr(o)- stomach, digestive gastritis, gastroscope, gastrula, gastrectomy, gastropod
-gate a scandal Watergate, negate, Irangate, interrogate
gem(m)- bud, producing gemma, gemmoid, gemmule, gemmate, gemmiferous
-gen- formation, development, Genesis, spermatogenesis, oogenesis, gameogenesis
origin, birth, producing generator, generation,
-genic origin, kind, giving rise to carcinogenic, cytogenic, mutagenic, eugenics, photogenic
genus class, to become general, generic, genuine
-gen(y)- race, kind, tribe, origin genealogy, genotype, progeny, homogeny
ge(o)- earth geology, geography, geometry, geotropism
geri- old geriatrics, gerontology, gerontocracy
germ- sprout, seed germinate, germicide, germinal disk
-gesto- to carry digestion, ingested, gestation
giga- giant giantism, gigameter, gigabyte, gigantic
gingiv- gums gingiva, gingivitis
glaci- ice glacial, glacier, glaciate, glacis
glans acron gland, glandular, glandule, glans penis
glauc- gray, blue gray glaucoma, glauconite, glaucous
glea- glue, gelatinous neurogleal, mesoglea
glob- ball gamma globulin, globe, globin, globerigina
glom- make a little ball glomerulus, conglomerate, glomerule
gloss- tongue hypoglossal, glossary, toxiglossa
glott- tongue glottis, epiglottis, polyglot
gluc- sugar glucose, glucinum
glyc(o)- sugar glycogen, hypoglycemia, hyperglycemia glycerin
-gnath- jaw Agnatha, gnathopod, prognathous
-gnos(is)- knowledge, belief prognosis, diagnosis, agnostic, gnostic
gon- sexual, seed gonads, gonorrhea, gonophore
-gon angle polygon, pentagon,
-grad- step centigrade, graduate, gradual, gradus
-gram- written record telegram, diagram, grammar, program
-graph- write or draw photograph, topographical, graphite, polygraph, autograph
-graphy recording, description geography, cardiography, enterography, biography
-gregate gather congregate, aggregate
-gress to walk, entrance digress, transgress, ingress, egress, progress
gutta- drops, dripping guttation, gutter, guttate, guttula
gymno- naked gymnospore, gymnosperm, gymnasium
gyn(ec)- female, woman, gynecology, gynecologist, gynoid
-gyro- to whirl, revolve or spin gyrate, gyroscope, autogyro, gyroidal

PRS MEANING EXAMPLE WORDS

H
Select another letter.

hal- salt halophyte, halitosis, halide, halite, halogen lights
hallu- wander in mind hallucinate, hallucination, hallucinogen
haplo- single haploid, haplosis, haplopia, haplont, haplology
hect- hundred hectare, hectogram, hectoliter, hectometer
-hedron seat, face, shape hedral, tetrahedron, icosahedron, heptahedron, euhedral
heli- spiral, screw helix, helicopter, helicoid, helictite
helio- sun heliotrope, heleograph, heliometer, heliostat, heliotaxis
helminth- worm Platyhelminthes, helminthic, helminthiasis, anthelmintic
hemat- blood hematoma, hematology, hematocrit, hematopoiesis
hem(o)- blood hemoglobin, hemostat, hemostasis, hemophilia, hemophobia
hemi- half hemisphere, hemimetabolous, hemicrania, hemicycle,
hepat- liver hepatitis, hepatic vein, hepatectomy, hepatoma
hepta- seven heptad, heptagonal, heptarchy, heptathlon, heptastich
herb(a)- plant, grass, green crop herbivore, herbaceous, herbal, herbalist, herbotology
-hereo to cling, stick adhere, adhesion, adhesive, cohere, cohesion
herp- pertaining to reptiles herpetology, herpetologist, herpetological
heter(o)- different, other heterozygous, heterotrophic, heterosexual, heterogenous
hexa- six hexapod, hexagonal, hexameter, hexagone, hexangular
hibern- winter hibernate, hibernal, hibernaculum
hist(o)- tissue histology, histocyte, histogram, histamine, histopathology
-holic love, addiction alcoholic, workaholic, chocoholic
holo- entire, whole holoblastic, holophytic, hologamous, holographic, holocrine
homeo- sameness, likeness homeostasis, homeobox, homeopath
homi- man hominid, homicide, hominoid, Hominidae
homo- alike, similar, same homozygous, homologous, homogenous, homosexual,
homotypic, homogeny
-hood order, condition brotherhood, sisterhood, manhood, falsehood
hyal- glass hyalogen, hyaline, hyaloid, hyalite, hyloplasm
hydr(o)- water, fluid, hydrolysis, hydrophobic, hydrocephalus, hydrant
hydroelectric, hydroponics, hydrothermal, dehydrate
hygr(o)- damp, moist hygrometer, hygroscopic, hygrophilous
hymen- membrane hymeneal, hymenoptera, hymenotomy
hyper- above, excessive, over, hypertonic, hyperactive, hyperglycemia, hyperthyroidism,
more than normal, beyond hyperthermia, hypertension, hyperventilate, hyperkinetic
hypn- sleep hypnotherapy, hypnotize, hypnotic, hypnosis
hypo- under, less than, below, hypotonic, hypodermic, hypoglycemia, hypotension,
beneath hypothermic, hypoallergenic, hypochondria
hyster- uterus, womb hysterectomy

PRS MEANING EXAMPLE WORDS

I
Select another letter.

-ia condition, state anoxia, hysteria, hypothermia
-iac pertaining to iliac, hypochondriac, maniac
-ial of, relating to pericardial, cranial, medial, arterial
-ian one skilled in, resembling physician, comedian, librarian, amphibian
-iasis diseased condition myiasis, psoriasis, elephantiasis, taeniasis, histomoniasis
-iatry- treatment, healing podiatry, psychiatry
-iatrics medical treatment geriatrics, pediatrics, psychiatrics,
-ible capable of being incredible, terrible, visible
-ic pertaining to, having biotic, manic, hyperglycemic, hypodermic, medic
ichthy- fish, referring to fish ichthyology, Chondrichthyes, icthyoid
-ician specialist physician, technician, mortician, musician
icon- image iconic, iconography, iconoclast
-ics technology physics, aerodynamics, forensics, acoustics, mathematics,
-id quality, tending to, tepid, hominid, acid,
connected with buninoid, amoeboid
idi(o)- individual, one's own, self idiosyncracy, idiom, idiopathy,
-idium small one, structure antheridium, basidium, pycnidium
-ify to become, make petrify, basify, rectify,
ignis- fire igneous rock, ignite, ignition
ile- segment of, relating to docile, compile
ileo- twist ileum, ileostomy, ileitis
im- not imbalance, imitation, impassible, imperfect, impede
immun- safe, exempt, free immune, immunity, immunized
in- in, into, not, without inability, inferior, incoherent, intangible
-in pertaining to melanin, insulin, epinephrin, pancreatin
incis- cut into incisor, incisive, incisory
indo- blue, violet indigo, indol, indophenol
infer(i)- below, under inferior, infernal, inferiority
infra- below, under, beneath infrastructure, infrared, infraclusion
-ing act of healing, growing, pumping, blocking, repeating
inter- between, among intercellular, intervention, internet, interval, interlude
intra- within, inside of intracellular, intravenous, intramural, intraocular, intranet
intro- into, within introversion, introduce
-ion act of, process of extinction
-ior pertaining to senior, junior, juror
-ious full of, having bilious,
iris- rainbow color iris, iritis, iritomy, irisopsia
-ish of, relating to, like greenish, tallish
-ism condition, belief in parasitism, alcoholism, botulism,
iso- equal isotonic, isometric, isogamy, isoptera, isobar, isopod
-ist one who specializes in dentist, botanist, ophthalmologist, dermatologist
-istics the science of the nature of statistics, ballistics, linguistics, cladistics
-ite nature of, quality of somite, stalagmite, trilobite,
-itis inflammation, infection appendicitis, arthritis, hepatitis, bronchitis, gingivitis
-ity state, quality, degree formality, normality
-ium chemical element or group ammonium, barium, californium
-ization action, result of making ionization
-ize cause to be, treat with materialize, idolize, ionize

PRS MEANING EXAMPLE WORDS

J
Select another letter.

-ject throw, hurl eject, project, projectile, reject, trajectory, interject
judic- judge judicial, injudicious, judicature
junct- join adjunct, conjunction, disjunction, neuromuscular junction
-juven- youthful rejuvenate, juvenile, juvenescent

K
Select another letter.

karyo- nucleus karyotype, eukaryote, prokaryote
kerat- cornea, horn keratectomy, keratin, keratitis
kilo- one thousand, 1000 kilometer, kilogram, kilowatt, kilocalorie
-kines(a)- movement, action kinesthetic, kinesiology, telekinesis, cytokinesis

PRS MEANING EXAMPLE WORDS

L
Select another letter.

lab- labor, change labile, laboratory, lability
labi- lips labia
lacer- mangled, jagged lacerate, lacerations, lacerated
lacri- tear, cry lacrimate, lacrimator, lachrymose
lact- milk lactate, lactose, lactobacillus
lacu- pit, basin lacuna, lacunose, lacustrine
lamella leaf or layer middle lamella, lamellate, lamellose, lamelliform
-lamin- layer, thin sheet, scale laminate, laminectomy, laminitis
lana- wool lanolin, lanate, lanary
lance spear, dart lancet, lancelet, lancinate
langui- faint, weak languid, languish, languor
lapar(o)- abdominal wall laparotomy, laparocele, laparocele, laparoscope
-lapid- stone dilapidated, lapidary, lapillus, lapidary
lard fat, pig fat larder, lardacein, lardaceous
larva- ghost, spirit of larvae, larval, larvate, larviparous
laryng- throat, gullet larynx, laryngitis, laryngoscope
laten- hidden, lurking latent, latescent, latency
later- brick, red lateritious, laterite, lateritic
later(o)- side, lateral unilateral, bilateral, lateroversion
lati- broad latitude, laticlave, latifoliate
lax- loose laxation, laxative, laxity, relaxation
lega- bequeath legacy, legal, legate,legalization
legit- lawful legitimate, legitimist, illegitimate
lepido- scale, scaly, flake leprosy, lepidoptera, lepidote
-less lack of, without useless, homeless, childless, painless
leuk(o)- white, colorless, clear leukocyte, leukopenia, leukoderma, leucopathy, leucopyrite
levat(a)- to raise levy, leviable, levant, elevator, levee
leve- balance, to the left level, lever, leveful, levogyrate
lex- speech, word, read, law lexicon, lexicology, dyslexia, lexeme, lexical
libra- balance, even librate, deliberate, equilibrium, libratory
libri- tree bark liber, libriform, liberaceous
liga- to bind ligament, ligature, ligate, liable
ligini- wood ligneous, lignin, lignose, lignite
limbus edge limbate, limb, limbic, limbo
limin- threshold limen, liminal, eliminate, limit
linea- line lineage, lineal, lineolate
lingu- tongue lingulate, linguistics, lingual, bilingual, linguoversion
-ling smaller, younger, weaker hatchling, saoling, duckling, earthling
linum flax linoleum, linnet, linen, lingerie
lip- fat lipid, liposuction, lipase, lipoma, lipemia
liqua be fluid liquor, liquid, liquate, liquescent
lith- stone lithograph, monolith, neolithic, lithosphere
-lobe- rounded section lobectomy, lobotomy, lobular, frontal lobe,
loca- place location, locus, locomotive
-logo- speech, thought logical, dialogue, eulogy, apology, logogram
-logy study of, a science biology, ecology, teratology, zoology, physiology
loph- tuft, crest lophodont, lophobranch, lopholith
lubri- slippery lubricant, lubricate, lubricious
luci- light lucid, luciferin, lucifer, luciferase, lucubratory
-lud- play elude, allude, elusive, ludicrous
lumb- lower back, loin lumbar, lumbago, lumbus, elumbated, lumbago
lumen- light illuminate, luminescent, bioluminescent, lumenophore
luna- moon lunar, lunatic, lunacy, lunate, luniform, lunitidal
lunul- moon-like lunula, lunulated, lunular
lupus- wolf lupine, lupus vulgaris, lupoma, Canis lupis
lut- yellow, golden luteolin, corpus luteum, luteous
-ly manner, like quickly, laterally, neuroticly, chronologically
lymph- clear fluid lymphocyte, lymphoid, lymphoma, lymphatic
lyo- loose lyophilic, lyophobic, lyogenic
-lysis- to break up, loosen, burst, lysosome, lysis, hydrolyze, analyze, dialysis
dissolving, to split, release cytolysis, hemolysis, hydrolysis, glycolysis

PRS MEANING EXAMPLE WORDS

M
Select another letter.

macro- large, enlarged, elongated macroscopic, macrophage, macronucleus, macrobiology
madre- mother madreporite, madreporaria, madreporiform, madrepora
magma to knead dough, a pasty mass magma, magmatic, massecuite, milk of magnesia
magn(i)- great magnification, magnificent, magnate, magnum, magna carta
magnet- expressing strong attraction magnetic, magnetize, magneto, magnetite
-mal(i)- bad, faulty malpractice, malocclusion, malodorous, malformation,
malignant, malicious, malign, malnutrition, diamal, malody
-malacia abnormal softening,soft malachite, malacology, malacophilous, malaxate
mall- hammer malleable, malleate, malleolus, mallet
mamm- breast mammogram, mammary gland
mandi- lower jaw,chew mandible, mandibular, mandibulary
mani- hand manipulate, manicure, maniple, manifold, manifest
-mania insane desire, compulsion manic, maniac, manic-depression, kleptomania, mythomania
manu- a hand manufacture, manual, manumission
mar- sea marine, maritime, marinate, meremma, mariner
masto- breast, meat mastectomy, mastitis, mastoid, mastodon, mastopathy
mastigo- whip mastigote, mastigophobia, Mastigophora
materi- matter material, materialize, materalistic
-matic of, relating to plasmatic, somatic, automatic, mathmatic, spermatic
matin morning matins, matinee, matinal, matutinal
maxi- many, most, highest maximum, maximal, maxim, maximize, maximization
maxill- upper jaw maxilla, maxilliped, maxillary
-mea to pass (through) permeate, permeability, permeation
mechani- machine mechanical, mechanic, mechanize, mechanoreceptor
meddl- mix meddler, miscellaneous, miscible, miscibility, immiscible
medi- middle median, mediate, mediastinum, mediocre, medieval
medic- physician, heal medicine, medical, medication
mega- large, one million, great megabyte, megaphone, megalopolis, megadose
-megal(o)- enlargement megalocephaly, megalomaniac, megalosaur
melan- black melanocyte, melanin, melancholy, melanoma, melanoid
memor- mindful, from memory memoir, memorial, memorandum, memorable, memoriter
menac- threats menace, menacing, menaced
mening- membrane meninges, meningeal, meningitis
mensa- table, food mensa, mensal, commensalism, commensial
mensu- to measure mensurative, mensuration, mensurable
ment- jaw (lower) mental, mental point, mentum, mentonniere
ment- mind mental, mentality, mention, demented
-ment act of, that which development, atonement, fragment, aliment, movement
-mer form, shape, part polymer, blastomere, metamerism, merognostic
mes(o)(i)- middle, intermediate mesoderm, mesophyll, mesothorax, mesial, mesozoic
meta- after, beyond, change in metamorphosis, metaphase, metastasis, metatarsal,
form, later, in succession metaphysics, metabolism, metazoan
meteor- weather meteorologist
-meter- means of measurement millimeter, centimeter, diameter, photometer, micrometer
-metr- a measure, measurement isometric, metronome, trigonometry
metr(o)- uterus, womb, mother metropolis, metritis, metronymic
micro- minute; one-millionth microscopic, microbiology, microbe, microorganism
mid- in the middle of mid-term, midsummer, midpoint, midbrain
milli- one-thousandth, thousand millimeter, millipede, millenium, milliampere, milligram
mime- mimic, copy mimosa, mimotype, mimeograph, pantomime
mine burrow, mine miner, mineral, minethrower
mini- least, small minimal, miniature, minimum, miniskirt, miniseries
minis- assistant, help minister, administer, administrator, ministry
minu- less minute, minuet, minus, minuend
mio- to shut, less miotic, miocene, miosis, myopia
mira- wonderful miraculous,miracle, mirage
mis- bad, wrong miscarrage, mistake, misinform
miso- hate misogyny, misanthropy, misogamy
miss- to send missile, missionary, mission
-mit to send transmit, permit, remit, admit,
mito- thread mitosis, mitochondria, mitotic
-mobil- movable automobile, immobility, mobility, mobilize, mobile
modus regulate moderate, modality, module, modus operandi
mola- mill, grind molar, molaris, molary
mole- mass, weight mole, molest, molecule, molecular
mollis- soft mollusk, mollusca, mollify, Alchemilla mollis
mono- one, single, alone monocular, monohybrid, monocotyledon, monolith, monorail
-morph- shape, form, structure metamorphosis, morphology, endomorph, ectomorph,
lagomorph, polymorphic, isomorphism
mor(t)- death morgue, rigor mortis, mortify, mortuary, mortal
moto- moving motor neuron, motile, motion, motive
muc- mucus, be moldy mucus membrane, mucin, mucilage, mucedinous
mult(i)- consisting of many units multicellular, multitude, multipolar, multiple
mural wall murals, intramural, muriform
mut(a)- change mutation, mutagen, mutate, mutability
-mycin obtained from fungi streptomycin, neomycin, erythromycin, viomycin
myc(o)- fungi mycology, mycoprotein, mycosis, mycorrhiza, mycelium
myel- spinal cord, bone marrow myelitis, myeloma, myeloid, myelocyte
myo- muscle myocardium, myofibril, myotome, myopathy, myoclonus
myri- ten-thousand myriad, myriagon, myriagram, myriapod

PRS MEANING EXAMPLE WORDS

N
Select another letter.

nano one billionth nanometer
narc- sleep, numbness, torpor narcolepsy, narcotic, narcosis
nas- nose nasiform, nasology, nares, nasopharynx
nat- birth, to be born neonatal, nation, native, nativity
-naut- ship, sailor cosmonaut, nautical, astronaut, nautilus, nausea
nebul- fog, mist nebula, nebulous, nebulize
necr(o)- death, dead, corpse necrosis, necrotic, necrophilia, necropolis
-nema thread, round nematode, nematocyst, nematoform
neo- new, recent neonatal, neonate, neoclassic, neophyte, neologism
nephr(o)- kidney nephron, nephritis, nephrocele, nephrotomy, nephrosis
-ness state, quality, degree cleanness, brightness, fitness
neur(o)- nerve neurology, neurotransmitter, neuron, neuroblast,
neuromuscular junction, neuralgia, polyneuritis
neutr(o)- neither one nor the other neutron, neutrosphere, neutrino, neutrophil
nictare- to wink, blink nictitate, nictitation, nictitating membrane
nid- nest, center nidus, nidulant, nidology
nigr- black nigro, nigrescence, nigrosine, denigrate, streptonigrin,
noct- night nocturnal, noctilucent, noctograph, noctiluca, noctambulism
nod(o)- knot, swelling nodule, nodular, nodulous, nodical
nomen- name binomial nomenclature, nominal data
-nomy science of, law taxonomy, anatomy, economy, aeronomy, autonomy, isonomy
non- nine, not non-disjunction, nonsense, nonagon, nonferrous, nonabrasive
norma rule, average normal, normality, abnormal, normalcy, normative
noso- disease nosogeny, nosology, nosomania
nota- know, notable notary, notation, notarize, note, notion
-noto- the back notocord, pronotum, notoderm, notomorph
-nova- new novel, novelty, novacaine, innovation, supernova
noxa hurt, harm obnoxious, noxious, noxal, noxiousness, nosode
nucle- kernel, nut nucleus, nucleolus, nuclear, nucleoplasm, enucleate
null- none, no, zero null, nullify, nullipore, nulliparous, nullification
nutri- nourishing, feed nutrition, nutrient, nourish, nourishment

PRS MEANING EXAMPLE WORDS

O
Select another letter.

ob- over, toward, against, to observe, obtrude, obstinate
obver- toward, turn obversant, obvert, obverse, obvolute
oct(o)- eight octopus, October, octagon, octave, octopod
oculo- eye, vision binocular, monocle, oculist
-odo- way, path odometer, anode, cathode
odont- tooth orthodontist, mesodont, macrodont, ogleodont, odontoblast
offic- work-do office, officer, offical, official, officious
-oid resembling, like amoeboid, anthropoid, hominoid, ovoid, mongoloid
-ol ending for an alcohol methanol, ethanol, glycol, isopropenol
ole- oil oleo, oleomargarine, oleoginous, oleate
olfact- to smell olfactory, olfaction, olfactometer
oligo- few, little, small oligarchy, oligochaete, oligodontia
-ologist one who studies biologist, ornithologist, entomologist, archaeologist
-ology study of, science of biology, ecology, teratology, zoology, physiology, nosology
-olus small nucleolus
-oma tumor, swelling hematoma, glaucoma, carcinoma,
-ome biological entity genome, biome, kinome, physiome
-omics area of biology protemics, kinomics, neuromics, genomics, chronomics
omni- all, many omnivore, omnipresent, omnibus, omnipotent, omniscient
omphal- navel omphalos, omphalocele, omphaloskepsis
onco- tumor, cancer oncologist, oncology
onoma- name onomastic, onomatopoeia, onomatomania
onomy- knowledge of astronomy, taxonomy, anatomy, economy, agronomy
onto- being, existence ontology, ontogeny, ontological
-(o)nym name pseudonym, anonymous, caconym, acronym, anonymous
oo- egg cell, beginning oocyte, oogenesis, oogonium
opera work opus, operand, operate, operator
operc- a cover operculum, opercle, opercular, operculate
ophthal- eye ophthalmology, ophthalmic, ophthalmoscope, ophthalmologist
-opia vision, sight myopia, presbyopia
opin- think opinion, opine, opinionated
-opsis- appearance, sight synopsis, macropsia, caryopsis, diposide
-opsy examination biopsy, autopsy
opt- choice option, optimal, opt., optative
-opt(i/o)- eye, vision, sight optometrist, optical, optician, optical illusion
-or one who doctor, operator, accelerator, orator
ora- mouth, pray oral, orifice, orator, oracle
orb- circle orbit, orbiclate, orbital, orbicularis
orchi(o)- testis orchidectomy, orchitis, orchiotomy
ordino- set in order ordain, order, ordinal, ordinance
ornith- bird ornithology, ornithopter, ornithosis
orno- to adorn ornamnet, ornate, adornment, ornamental
ortho- straight, regular, upright orthopedic, orthodontist, orthodox, orthographic
-ory having the nature of, place laboratory,factory, dormitory, rectory
os- bone osteocyte, osteoporosis, osteichthyes, periosteum, ossify
oscill- to swing oscillate, oscillogram, oscilloscope
-ose sugar ending glucose, fructose, deoxiribose, ribose, lactose, sucrose
-osis abnormal condition, state cytosis, prognosis, thrombosis, ostosis, psychosis, neurosis
of, process of, disease tuberculosis, varicosis, exocytosis, arteriosclerosis
osm- sense of smell, odor osmic, osmious, osmium
ossi- bone ossiferous, ossification, ossify
oste(o)- bone osteal, osteoblast, osteocyte, osteomyelitis, osteoperosis
osten- exhibit, reality ostensible, ostentatious, ostentation, ostensory
osti- mouth, door ostium, ostiary, ostiole, ostiolar, ostium
-ostomy new opening colostomy, ileostomy, osteomate, urostomy
ostra- oyster, shell ostracize, ostracod, ostracean, ostracion
oto- ear otocyst, otology, otoscope, otitis, otomycosis
-otic affected with, producing symbiotic, anabiotic, leukocytotic, psychotic
-otomy cut into, incision lobotomy, tracheotomy
-ous containing, pertaining to dexterous, porous, bulbous, poisonous
ov(i)- ovum, egg cell ovary, oviduct, ovule, ovipositor, ovoid, oval
ox(y)- form, oxygen, rust oxidize, deoxyribonucleic acid, oxyhemoglobin, oxiodic

PRS MEANING EXAMPLE WORDS

P
Select another letter.

pachy- thick pachyderma, pachydactyl, pachycarpous, pachyglossal
paleo- ancient, primitive paleology, paleontology, paleolithic, paleocene
pali- repeat, again palisade, palingenesis, palinode
palm hand, a tree Palmae, palmar, palma, palmary, palmaceous
-palpa- touch, feel palpate, palpae, palpable
palud- a swamp paludal, paludamental, paludism
pan- all panorama, panacea, pandemic
papill- nipple papillae, papilloma, papillary, papescent
par- bring forth parent, parturition, parthenogenesis
para- beside, beyond, near parasite, paramedic, paranoid, parathyroid, parabola
pariet- wall parietal, paries, parietal bone, parietal pericardium
-parous birth, bearing young oviparous, viviparous, nulliparous, gemmiparous
pate- open, shallow, pan patella, patent, paten, patera, pateriform
pater father paternal, paternity, paterfamilias
-path(o)- disease pathogenic, pathology, pathogen, psychopath, pathetic
-pect- chest pectoral, pectoralis, expectorate
ped- child, beginning pediatrician, pediatrics, pedigree, pedokinesis, pedophile
pedogenesis,
-ped(i)- foot pedal, bipedal, pedestrian, pinniped, pedipalp, pedicle, uniped
-pel drive expel, propel, repel
pell- skin, pelt pell, pelt, pelage, pellagra, pellicle
pelor- monster peloric, peloria, pelorism, peloriate
pelv(i)- pelvis, basin pelvimetry, pelvifixation, pelviperitonitis, pelvilithotomy
peltas- small leather shield peltast, peltry, peltate, peltarion
pena- punishment penal, penalize, penalty, penance
-penia deficiency, lack leukopenia, neutropenia, pancytopenia
pend- to hand appendage, appendix, pendant, dependent, pendicle, impend
pen(e)(u)- almost peneplain, peninsula, penumbra, penultimate
penetr- put within, inner most penetrate, impenetrable, penetralia
penna feather, wing pennate, impennous, pennigerous, pennant, pennon
penta- five pentamerous, pentose, pentameter, pentagon, pentadactyl
-peptein digestion pepsin, peptone, eupeptic, dyspeptic, peptogen
per- through, completely permeable, perjury, perspective, perfuse, perfervid, perforate
perfor- bore into, pass through perforate, perforation, perfoliate
peri- around, surround perimeter, periosteum, peritoneum, pericardium, periodontal
period a portion of time periodic, periodate, periodicity, periodical, photoperiodism
pessimi- worst pessimistic, pessimize, pessimal, pessimism, pessimist
petiol- fruit-stalk, stem petiole, petiolar, petiolate, petiolaceous
phac- lens of eye, lentil phacoid, angiophacus, phacocele
phaeo- brown, dusky, dun pheochrome, Phaeophyta
-phag(o)- eat, swallow phagocyte, phagocytosis, Phytophagous, monophagy
-phage eater macrophage, bacteriophage, xylophage
phal- fingers, toes phalanges, phalanx, phalanger
-phan- show, appear phantom, cellophane, diaphanous, tryptophan
pharmac- drug pharmacy, pharmaceutical, pharming
pharyng- throat pharynx, pharyngeal, pharyngoscope, pharyngotomy
-phas- speech aphasia, aphasy, aphasic, dysphasia, phatic
-phase stage, condition prophase, metaphase, anaphase
pheno- visible, show, to shine phenol, phenolphthalein, phenomenon, phenotype, phenomenal
-phil(o)- love, fondness philosophy, philanthropy, philocalist, pedophile, hydrophile
philia- attraction to eosinophil, hemophilia, necrophilia
phleb- vein phlebitis, phlebology, phlebotomy, phlebosclerosis
phlob- tree bark phlobophene, phloem, phlogopite
-phob- fear, dislike, aversion claustrophobia, agoraphobia, hydrophobic, acrophobia
-phon(e)- connected with sound phonetic, telephone, phonograph, microphone, angiophone
-phore carrier, carry, bear chromatophore, melanophore, gametophore, cytophore
-phoresis transmission, carrying electrophoresis, isotachophoresis
-phoria feeling euphoria, esophoria, phoronomy
phos- light phosphorescent, phosphorus, phosphine
photo- light, pertaining to light photosynthesis, phototroph, photograph, photon,
phototropism, photometer, photoperiodism
-phragm- fence diaphragm, phragmocone, phragmospore
phren- mind, nerves phrenic, phrenitis, phrenesiac, phrenalgia, frenzy
phyco- seaweed, algae phycology, phycobilin, phycocyanogen, phycomycetes
-phyl- tribe, class phylum, phylogeny, organophylic
phyll- leaf chlorophyll, mesophyll, megaphyllous, phyllomorph
physic- nature physic, physical, physician
physio- produce, function physiography, physiotherapy, physiocracy, physiognomy
-physis- change, growth physique, epiphysis, hypophysis
physo- swelling or distention physometra, physocele, physograde, physiotherapy
-phyt(e)- plant phytohormone, phytoplankton, epiphyte, Chlorophyta,
Tracheophyta, phytotoxic, phytochemistry, phytogenesis
pil(i)- hair piliform, pile, pilar, pilous, piliferous
pinn- feather pinniped, pinnate, pinnigrade
pino- to drink pinocytosis
pisci- fish pisces, piscivorous, piscatory, pisciform, piscinal
placeo- pacify, quiet placebo, placid, placate, placative
plagia- kidnapping plagiarize, plagiarism, plagiarist
plagio- sideways, oblique plagiotropism, plagal, plagioclase
plan(o)- flat, moving planogamete, planometer, planoblast, plane, planet, planaria
-plasia development, growth achondroplasia, desmoplasia
-plasm(a)- fluid substance, mold, protoplasm, cytoplasm, ectoplasm, plasmolysis, plasmatic,
form of life plasma lamp, plasma theory, plasmacyte, plasmacytosis
-plast(y)- particle, grandule, chloroplast, leucoplast, cytoplast, plastogamete, autoplast,
formed, growth, shape neoplasty, thoracoplasty, aplastic, euplastic, mammaplasty
plat(y)- flat, broad platform, plate glass, plateau, platypus, Platyhelminthes
plaud expression of praise applaud, plausible, plaudit, laudable, implausible
-plegia paralysis monoplegia, hemiplegia, quadriplegia
-plect to braid, weave, twist plectin, complect, complexion, complex, complexus
pleo- more pleopod, pleocytosis, pleochroism, pleomorphism
-plete to fill complete, deplete, countreplete, deplete, replete
pleth- too full, excessive plethora, plethoric, plethysmograph
pleur- rib, side pleura, pleurisy, pleuritic
plex- interwoven, to strike plexor, plectrum, pleximeter, perplex, plexiform,
plica- to fold, a ridge plica polonica, pliant, compliance, plication
plum- feather plumage, plumose, plume, plumosity
-pne(a/um)-air, lungs, breathe dyspnea, pneumonia, pneumatophore, pneumatic, apnea
-pod(a) foot, feet gastropod, pseudopod, tripod, arthropod, hexapod, podium
polar- opposite, opposed polarity, Polaris, polarization, polarize, dipolar
poli- grey matter, gray polioclastic, poliosis, polio, poliomyelitis
-polis city metropolis, metropolitan, acropolis, astropolis, necropolis
poly- many, much polyhybrid, polypeptide, polysaccharide, polygamy, polygon
pom- knob, fruit pomiferous, pomegranate, pomology, pome, pommel
pons bridge pons, Pons Fabricius, pons asinorum
popu- people, public population, populace, popular, populate, populacy
por- channel, tiny hole pore, porous, porosity, porifera, osteoporosis
port- carry seaport, portable, mediport, portage, portfolio, import, export
porta- gate portal, port-of-call, portcullis, portico
-potent power potent, potentate, impotent, omnipotent, equipotent
-posi- place position, deposit, imposition
post- after, behind postnatal, posterior, postpartum, postglacial, posterior
pota- river, drink potable, potatory, hippopotamus, potamian, Potameides
praeco- early, premature precocial, precocious, precoces
pre- before, in front of prenatal, preaxial, premedical, prehistoric, preview, prediction
-prehend seize, grasp comprehend, apprehend, prehensile
preter- past, beyond, by preternatural, preterhuman, preterist, preterlegal
prim- first primary primal, primary, primitive, primacy
-proach near approach, reproach, unapproachable, reproachful
pro- before, first prophase, propel, prognosis, proboscis, proceed
pro- for, yes pro-choice, protagonist, proton, proportion, pronoun
-proct- rectum, anus proctoscope, proctology, proctodaeum
propag- multiply, generate propogate, propagation, propagable, propaganda
propel forward-drive propeller, propellant, propulsion
pros- near, in addition to prosenchyma, prosencephalon
prot(o)- first, primary protozoa, protoplasm, prototype, protolithic, protohuman
prox- near, next proximal, proxy, approximate, proximity
pseudo- false pseudopod, pseudocoel, pseudomorph, pseudonym
psora itch, mange psoriasis, psoric, psoralen
psych- mind, mental psychology, psychic, psychotic, psychosomatic
pterid- fern pteridology, pteridophyte, pteridologist
-pter- wing, to fly pterodactyl, macropterous, chiropteran, helicopter, ornithopter
-ptosis falling, drooping ptosis, blepharoptosis, nephroptosis, apoptosis
puber- adult, grown up puberty, puberal, pubescent, puberulent
publi- populace, people public, publication, publicize
puerp- child(birth) puerperal, puerpera, puerperium
pulmo- lung pulmonay, pulmotor, pulmometer
pulvi- cushion, swelling pulvinus, pulvillus, pulvinate, pulvinar
pupa- girl, doll pupae, pupate, pupation
purg- to clean, purify purge, purgatory, purgative
putr- rotten, decay putrid, putrefacation, putrefy, putrescence
puknos- strong, thick, dense pyknodysostosis, pyknomorphous, pyknosis
pyelo- kidney, pelvis pyeloplasty, pyelitis, pyelostomy, pyelonephritis, pyelogram
pylo- gate keeper pylon, pylorus, pyloric
-pyo- pus pyogenic, pyoderma, pyorrhea
pyr(o)- fire, fever Pyrrophyta, pyrophobia, pyromaniac, pyrogen, pyrolysis
pytho- filth, rot pythocenic, python

PRS MEANING EXAMPLE WORDS

Q
Select another letter.

quadri- four, square quadrangle, quadrilateral, quadruped, quadruplets
qual- quality, characteristic quality, qualify, qualitative
quant- how much quantity, quantify, quantum, quantitative
quasi- to some degree, as if quasi-contract, quasi-stellar, quasi-empiricism, quasar
quart- fourth, four quartan, quarter, quartet, quartation, quartile
quer- to seek, search query, question, quest, inquest, conquest, request, requisition
quercin oak quercite, quercine, quercetin, quercitron, Quercus
quiet inactive, still, at rest quiet, quiescent, quietus, quietude
quint- fifth, five quintuplet, quintet, quinate, quincuncial, quincunx
quota- how many quota, quotient, quotidian, quotennial

R
Select another letter.

racem- cluster raceme, racemic, racemiferous, racemiform
rachi- spine rachiometer, rachitis, rachis, rachilla, rachitic
radio- wheel, spoke, ray radial, radiate, radioactive, radiometer, radiochemistry
radix root or point of origin radish, eradicate, radix point
radula scrape radula, radular, radulate, radulated, raduliform
ram- branching ramose, ramify, ramification, ramus, ramiform
rana- frog ranarian, ranarium, ranidae
ranc- stinking, foul smelling rancid, rancor, rancorous
raph- sew, stitch, seam raphia, raphe, raffia, raphide, raphis
rapi- plunder, to seize rapine, rapinous, rapacious, ravish
-ras- scrape, grate rasp, abrasion, abrade, razor
rati(o)- fixed, reason ratio, ration, ratify, rational, rationalize,
re- back, again, a new repeat, report, realign, retract, revise, regain, reflect
recidi- fall back, back slide recidivate, recidivous, recidivist, recidivation
rect- right, straight rectangle, erect, rectify, misdirect, redirect
regn- rule, prevail reign, regent, regal, regnant
reject- deny, back-throw reject, rejectaneous, rejecter, rejectamenta
relat- borne-back relate, relative, relativity, relation
relic leave-back, neglect relic, relict, derelict, dereliction
reliev relieve, lessen, light relief, relieve, alleviate
remedy heal-again, cure remedies, remedial, remediate
ren- kidney renal, reniform, renin, renal gland,
rendre give back render, rendition, surrender, rendering
repta- to creep reptile, reptant, reptilian, reptation
rere- rear, backward arrears, reredemain, reredos, rereign
resid- remain, left over residual, residue, residuum, residence
resil- leap or bounce back resile, resilient, resiliience, resilin, resiliometer
resist withstand, oppose resist, resistance, resistor,
resona- sound again, echo resonance, resonator, resounding
reti- a net, weblike retina, reticle, retia, retiary, reticulate
retor- back-twist retort, retorsion, retortion, retortamonad
retrac- pull back, draw back retraction, retractile, retreat, retractable
retro- backwards retrorocket, retrospect, retroactive, retrogress, retrovert
reve- throw back the veil reveal, revealable, revelation
revi- see again review, revise, revision
rhabd- rod, rodlike rhabdomyoma, rhabditis, rhabdocoele, rhabdomancy, rhabdite
rach- spine, backbone rachianesthesia, rachidian, rachopathy, rachilysisrhage
rheo- current, flow rheostat, rheotaxis, rheoscope
rhin(o)- nose, snout rhinoceros, rhinovirus, rhinoplasty
rhiz(o)- root, pertaining to roots rhizoid, rhizome, rhizopod, rhizocarpous
rhod(o)- red, rose rhodium, rhododendron, rhodamine, rhodolite
rid(i)- joke, laugh, jest, funny riant, rident, ridicule, ridiculous
rigid stiff, fixed, set rigid, rigidity, rigor, rigorous, rigor mortis
robur- strength roborant, robust, roberite
rogare ask, question rogatory, rogation, interrogate,
rostr(a) beak, prow rostral, rostrate, rostrad, rostellum, curvirostral, serratirostral
rota- wheel, circle rotary, rotor, Rotifera, rotation
-rraphy suture aneurysmorrhaphy
-rrhage break, burst hemorrhage, menorrhagia, mastorrhagia, metrorragia
-rrhea flowing, discharge diarrhea, gonorrhea, menorrhea, seborrhea, amniorrhea
rub- red, rosy rubella, rubeola, ruby, rubescent, rubric
rugos- wrinkle rugose, rugulose, rugosity, Rugosa
-rupt- break, burst rupture, interrupt, abrupt, rout

PRS MEANING EXAMPLE WORDS

S
Select another letter.

sac- sack, pouch sack, saccate, sacculus, bisaccate
sacchar- sugar monosaccharide, polysaccharide, saccharide, saccharine
sacr- sacred, holy sacrum, sacrament, sacrifice, saccharoidal
sagac- of keen perception sage, sagacity, sagacious, sageness
sagitta- arrow sagitta, sagittal, sagittary, sagittarius, sagittate
sal- salt saline, salimeter, salicylate
salic- willow salicin, salicaceae, salicylic acid
saliv- spit, spittle saliva, salivary, salivate, salivation
salping- fallopian tube salpinx, salpingitis, salpingian
salu- health salute, salubrious, salutiferous
salv- whole, safe salve, salvo, salvation, salvage
sanct- holy sanctify, sanctity, sanctuary, sanction, sacrosanct
-sangui- blood sanguine, sanguinolent, sanguicolous, sanguicolous
sanit- health, heal sanitary, sanitize, sanitation, sanitiarian, sanitarium
sapid- taste, flavor savor, sapidity, sapidness, insipid
sapien wise Homo sapien, sapient, savant, sapience
sapo- soap saponin, saponaceous, saponify, saponic acid, Sapindaceae
sapro- rotten, decay saprogenic, saprophyte, saprophagous, saprobe, sapropel
sarco- flesh sarcophagic, sarcolemma, sarcoma, sarcomere
sarment- prune, runner sarmentum, sarmentose, sarmentaceous
sartor- tailor, patcher sartor, sartorial, sartorius muscle
-saur- lizard like, reptile saurian, dinosaur, Ichthyosaur
saxi- stone, rock saxicava, saxifrage, saxitoxin, Saxicola, saxicholine
scabi- rough, itch scab, scabirs, scabicide, scabrous, scabious
scala- ladder, staircase scalar, scalariform, escalade, escalator
scalene- uneven scalene triangle, scalenous, scalenohedron
scand- to climb scandent, scandic, scansorial
scapho- hollow, bowl scapha, scaphoid, scaphopod, scaphocephalic
scato- feces, dung, excrement scatology, scatoma, scatoscopy, scatemia
scene stage scenic, scenery, scenography, scenographer
schizo- split, disunion, cleft schist, schizoid, schophrenia, schizomycetes, schistorrhachis
scien- to know science, scientist, scientific, sciential, omniscience
sciss- to cut scissel, scission, scissors, scissure
sclera(o)- hard sclera, sclerenchyma, sclerotic, sclerosis, scleroderma,
sclerata, arteriosclerosis, atherosclerosis
scoli- crooked, curved scoliosis, scoliotic, scoliokyphosis
-scope see, gaze, shadow microscope, telescope, periscope, odontoscope
-scopy inspection, exam endoscopy, colonoscopy, proctoscopy, laryngoscopy
scri(b/p) write manuscript, inscription, transcribe, scribble, describe, perscribe
scrob- marked with pits scrobicula, scrobiculate, scrobiculus
scrutia- careful observation scrutiny, scrutinize, inscrutable, scrutineer, scrutinous
sculp- to carve sculpture, sculptor, sculptile, sculpey, scalpel
scutum shield scutate, scutiferous, scutiform, scutelliform
scyph(o)- cup shaped, goblet scyphiform, scyphozoan, scyphozoid, scyphistoma
seb- grease, wax, oil, fat sebaceous gland, sebum, sebacic, seborrher, sebolith
-sect- cut, divide dissection, trisect, pinnatisect, sectism, transect, intersect, section
sedim- settling sediment, sedimental, sedimentary
seism- shake seismic, seismograph, seismology
selen- moon selenite, selenium, selenographer
sella- saddle sella turcica, dorsum sellae
sema- sign semantics, semaphore, semasiology
-semble same, similar, resemble, ensemble, assemble
semi- half, partly semicircle, semilunar, semi-detached, semiconscious, semiannual
semin- semen, seed seminar, seminal, inseminate
seni- old senile, senility, senior, seniority
sen(o)- six senary, senocular, senarius
sens- feel, perception sensation, sensitive, sensible, insensitive, insensate, sensual
sepa- covering, apart sepal, sepaloid, sepaline, sepalous, separate
seps- infection, make putrid sepsis, septicemia, sepsine, asepsis
sept- seven septuple, septuagenarian, septet, septennial
sept- wall, division septum, septal, septarium, septate
sequi- to follow, result sequel, sequential, sequence, consequence, sequacious
seri- silk-like serge, sericeous, sericate, sericulture
sero- body fluid, liquid serum, serology, serosity, serotherapy
serpen- creeping, crawling serpent, serpentine, serpiginous, serpentaria
serr- lock, crowd, bind serry, seragilo, serried,
serrat saw-toothed, jagged serrate, serrations, serrulate, sierras, biserrate, serratirostral
-sert join assert, insert
sesqui- one and a half sesquicentennial, sesquiplane, sesquioxide, sesquibasic
-sessi- sit, perch, attached sessile, session, insessores, insessorial, seance
seta- hair, bristle setigerous, setiferous, setiform, setaceous, polysetaceous
sex- six sexpartite, sexennial, sextuplets, sexcuspidate, sexivalent
-ship rank, quality, condition scholarship, courtship, penmanship, readership, professorship
sialo- saliva, salivary sialadenitis, sialoquent, sialagogic, sialolith, sialoanitis
sibilat- hiss sibilate, sibilant, sibilation, sibilance
-sicc- dry desiccate, exsiccate, desiccant, siccative
sider- iron siderocyte, siderography, siderolite, sideropenia
sigma- "S" shaped sigmoid colon, sigmascope, sigma curve
signum sign, signal, symbol sign, signal, signify, signate, signature, sigmoidal
silici- feel strong, flint silica gel, silicon, silicate, silicify, silicosis
siliq- pod, husk silique, siliquose, siliquoid, siliquous
silv(sylv)- forest, woods, country silva, silvae, silvanus, sylvan, sylvatic, silvaculture
simia- flat-nosed, monkey simian, simial, simioid, simious
similis alike, analogous similar, simile, facsimilie, simulate, similarity, similarly
sinistr- left, to the left sinister, sinistral, sinistrose, sinistrotorsian
-sinu- wind, bend, suggest sinuate, insinuate, sinuous, sinuosity
sipho- siphon, tube siphon, siphonifer, siphonophore, siphuncle, siphonaptera
-sis state, condition, process hypnosis, psychosis, trichinosis, loganamnosis
-sist stop, stand, delay insist, resist, desist, persist, assist
sito- grain, food sitomite, sitophobia, sitology, sitotoxin
skeleton dried body exoskeleton, endoskeleton, cytoskeleton
skia- shadow sciamachy, sciomancy, skiagraph, skiagram, skiascope
sol- sun solar, solarize, solarium
solen- channel solenoid, solenaceous, soleniform, solenidae, solenoconcha
solu- dissolve solute, solution, insoluble, resolution
-solv- to loosen solvent, resolve, absolve, dissolve, solve
soma(t)- body somatic, somite, somatoblast, somatogenic, somatopleure
somn(i)- sleep insomnia, somniferous, somnifacient, somnambulist, somnolent
-som(e)- body chrososome, centrosome, lysosome, autosome, monosome
son(a)- sound, resonance sonogram, ultrasonic, sonata, sonant, consonant, sonorous
-soph- wise sophomore, philosophy, sophisticated
sopor- lethargic sleep soporose, soporific, soporiferous, sopor, soporous
-sorb- suck in, swallow absorb, resorb, absorption, sorbability, sorbant
spadi- break, brown color spadix, spadicious, spadicose
-spasm draw, to rend spastic, spasmodic, spasticity, spasmatic, spasmolysis
spati- space, empty spatial, spacing, spacer
speci- type species, speciation, specimen, specialist
-spect- to look, behold spectator, inspect, circumspect, retrospect, prospect, spectacle
spectro- spectrum spectra, spectroscope, spectrometer, spectrometer
specul- spy, look, see speculate, speculum, specular
spel- cave, cavern spelian, spelunker, speleology, speleologist
-spend- to weigh out, hang expense. suspend, spence, spender
-sperm- seed, sperm, sow spermatozoa, spermatophore, carposperm
sphen- a wedge sphenic, sphenodon, sphenoid
sphere sphere, ball spherical, spheroidal, hemisphere, atmosphere
-sphygm- pulse, beat sphygmomanometer, sphygmoid, sphygmus
spic- spike, a point spicate, spiculate, spicule, spiculum
spir(o)- breathe inspire, respiration, aspirator, expire
spire a coil spiral, spireme, spiriferous, spirillum
splen- spleen, rancor splenish, splenic, spleenectomy, splenomegaly
spondyl- vertebrae spondylalgia, spondylitic, spondylopathy
spons- promise, pledge sponsor, response, spouse, responsible
spont- unconstrained, free will spontaneous, spontaneity, spontaneously
-spor(o)- spore, seed sporophyte, sporocyte, macrospore, sporocyst, sporangium
spum- foam, froth spumid, spumescent, spume, spumoni
squal- foul, dirty squalor, squalid, squalidity, squalidly
squam- scale, thin, plate squamous, Squamata, squamal, squamula, squamatic
squarros- spreading at tips, scabby squarrose, squarrulose, squarrous
stab- firm, stable, standing stable, stablize, establish, stability
-stan homeland, country Afghanistan, Pakistan, Frengistan, Bradistan, Uzbekistan
stagn- quiet pool, swamp stagnate, stagnant,stagnation, stanch
stalak- to drip, drop stalactite, stalagma, stalagmite, stalactiform
stamen- thread stamen, stamenate, stamina, staminodium
stanni- tin stannic, stannary, stannite, stannum
stapes stirrup stapedial, stapedectomy, stapediovestibular, interstapedial
staphyl- cluster, uvula staphylococcus, staphyloplasty, staphyline, staphyedema
-stasis control, stop, stationary homeostasis, hemostasis, isostasy, cryostasis, cytostasis
-stat device to check or stop, hemostat, thermostat, static, statute, rheostat, fungistat
stationary, still barostat
-stato- balance, equilibrium statocyst, statoblast, statoscope, stator
stauro- cross staurolite, stauroscope, staurophyll, staurophobia
-stear- fat substance stearate, stearone, stearic, steatoma, steatogenous
stella- star stellar, constellation, stellate
sten- narrow, constricted stenophyllous, stenographer, stenosis, stenochoria
-ster person associated with youngster, gangster, songster, mobster
sterco- feces stercolith, stercoroma, stercobilin, stercoraceous
stereo- 3D, solid, firm stereophonic, stereognosis, stereoisomer,
stereotactic, stereomicroscope
sterno- breast sternum, sternocostal, sternoscapular, sternalgia, sternoid
steth- chest stethoscope, stethometer, stethophone
stheno- strength asthenia, sthenic, asthenolith, sthenolagnia
-stigma- stain, spot stigmatize, stigmatic, astigmatism
-still- drip, drop distill, instill, stillicidium, stillicide
stipe stalk, stem, post stipes, stiple, stipellate, stipitate
stoich- step, go stoichiometry, stoichiology, stoichiological, stoichiometric
stoma(t)- mouth, opening stomata, cytostome, stomatitis, stomach, stomatopod
strabis- to squint strabism, strabisum, strabotomy, strabismometer
strang- halter, twisted strangle, strangulated, strangury
strati- layer, spread out stratus, stratum, stratiform, stratocumulus
strept- chains, twisted streptococcus, streptomycin, streptomycetes
stria- groove, furrow striae, striated, striation, striature
-strict- bind, upright, stiff strict, stricture, restriction, constriction
strig- scraper, bristle strigose, strigillose, strigate, strigilation
strob- twisting, turn strobic, strobila, strobile, stroboscope
stroma- mattress, bed cover stromatic, stromatolite, stromatin
-struct pile, build up construct, obstruct, destruct, structure, restructure
stud(e,i)- be diligent, zeal student, studio, studied, studious
styl- pillar, stalk, stem stylopodium, stylus, stylist, stylaster, styloid, styolite
styptic contract styptic, stypticit, stypsis
-suas- to advise, agree persuade, suasible, dissuade, suasion, suave
sub- under, below, smaller subdermal, subcutaneous, subspecies, submerge, subset
sublim- high, lofty, supreme sublime, sublimate, sublimity, sublimable
succu- juice succus, succulent, succulous, succulence
suda- sweat, perspire sudary, sudarium, sudatory, sudatorium, sudorific
sulc- pow, groove, furrow sulcate, sulcus, sulcation, sulciform
super(i)- above, over, upon supercede, superior, superscript, supernatural, supersonic
supin- lying back, downward supine, supinate, supination
supra- above, over, upon suprarenal, supraorbital, supramolecular
suppos- place under suppose, supposition, suppository, presuppose
-surg- rise surge, insurgent, insurrection
suspen- under-hang suspend, suspension, suspense, suspender
susurr- whisper, rustling susurrant, susurrus, susurrate, susurration
syco- fig, lump sycosis, syconium, sycamore, sycophnat
syllab- together-take syllable, syllabic, syllabus
sym- with, together, same symphony, symmetry, sympathy, symbol
symbio- dwell together symbiosis, symbiotic, symbiotically, symbiote, symbiont
sympto- together-fall, coincide symptom, symtomatic, symptomatology, symptomless
syn- with, together, united synapse, synergy, synthetic, syndicate, synchronous, synclitism
syncretism, syncope, syndactyl, syngamy, synod, synonymous
-synthes- put together, to make synthesis, photosynthesis, chemosynthesis, synthesize
syrin- tube, pipe syringe, syrinx, syringomyelia
system together-stand, combine systemic, systematic, systematist, solar system, organ system
systol- contraction systole, systolic, diastole, asystole, peristalic

PRS MEANING EXAMPLE WORDS

T
Select another letter.

tabe- wasting away tabefy, tabes, tabefacation, tabetiform, tabesence
tabul- board, plane surface table, tabular, tabulate, tabloid, tableau
tachy- rapid, fast, elevated tachypnea, tachycardia, tachyon, tachhydrite, hæmatachometer
tacit- be silent taciturn, tacitly, tacitness
tact- touch tact, tactile, tactometer, tactual
taen- ribbon, stretch Taenia, taenidium, taeniafuge, taeniacide
-tail to cut retail, detail, tailor
-tain to hold retain, detain, obtain
talo- ankle talus, taliped, talipes, talocalcaneal
tang- touch, feel tangible, tangent, tango, intangible, tangency
-tard- slow, late tardy, retarded, tardo, tarry, tardive, tardigrade
-tars- ankle tarsus, tarsae, tarsum, tarsier, tarsiiformes, metatarsal
tauro- bull taurus, taurine, taurobolium, tauriform
tauto- same, identical, repeat tautomerism, tautology, tautomeric, tautochrone, tautonym
taxo- arrangement, order taxonomy, taxidermy, taxiarch, taxonomist
-taxi- movement taxicab, taxiway, geotaxis, phototaxis, taximeter
techn- art, skill technician, technique, technology, technagogy
tegmen- cover tegula, integument, tegular, tegulary
tele- far, distant, long television, telephone, telegraph, telemetry, telekinesis
telo- end, complete telophase, teloblast, teleology, teleost
tellur(o)- earth tellurian, tellurium, tellurous, tellurion
temp- time, state temporal, temper, temperment, tempest
-tempt touch, try taunt, attempt, contempt, tempting
ten- to hold fast tenaul, tenant, tenacious, tenaculum, tenet
-tend(o)- stretch, sinew tendon, tendosynovitis, tendril, tendinous, protend,
protensive, protense, protasis
tenebr- gloomy, dark tenebrous, Tenebrionoidea, tenebrific
tens- tension tense, tensile, tensiometer, intense, tensility
tenui- thin, slender tenuous, tenuity, tenuis
tep(e/i)- warm tepid, tepify, tephrite, tepefacation
ter- three, thrice tertial, tertiary, tercet, tersulphide, ter-tenant
terat- monster, malformed teratology, teratism, teratogen, teratoid, teratoma
teres- round terete, Teres Major, ligamentum teres
terg- the back tergal, tergum, tergiversate, tergiversation
term- boundry terminal, terminate, terminus
tern- by threes ternay, ternate, ternion, ternately
terra- earth, land terrain, territory, terrarium, terrestrial
terri- frighten, intimidate terrify, terrible terror, terrorist
terti- third, thrice tertiary, tertian, tertial
-test witness attest, detest, protest, contest
tetan- rigid tetanus, tetany, tetanize
tetra- four tetrad, tetraploid, tetraspore, tetrapod
text- to weave texture, textile, textual, textbook
-th ordinal number (a noun) tenth, millionth, growth
thalam- chamber, bed thalamus, thalamic, thalamencephalon
thall- undifferentiated shoot thallus, thallophyte, thalloid
-thana- death euthanasia, thanatopsis, thanatos
thec(a)- sheath or case gonotheca, hydrotheca, spermatheca, ootheca
the(o/a)- God theology, atheist, polytheist, theogony, thesium, thearchy
therap- serve, treatment, look at therapy, therapist, therapeutic, theorem, theoretical
therm- heat, body temperature thermometer, thermodynamics, homeotherm
endothermic, exothermic, hypothermic, thermoreceptor
thigm- touch thigmotropism, thigmotaxis, thigmotropic
thio- compound with sulfur thioacetate, thiocyanate, thionic
thora(c/x)- chest thorax, thoracic, thoracentesis, cephalothorax
thromb- clot thrombus, thrombosis, thrombocyte, thrombin, thromboid
tinct- stain, color or tint tinct, tincture, tinctorial, tingible
tinea- mouth, worm tineal, tineoid, tineidae
tinni- ringing tinnitus, tingle, tintinnabulation
titan- giant, prodigious size titan, titanic, titanium, titansilicate
-tom(e) cutting, section, part microtome, dermatome, atom, diatom, epitome
-tom(y) cut, cutting, slice appendectomy, tonsillectomy, anatomy, tracheotomy
-ton(ic/o)- stretched isotonic, hypertonic, tonus, tonic,
topo- surface topography, topographical, topectomy
torsi- twist torsion, torsive, tortuous, torsiometer0.
tox(i)- poison toxin, toxic, antitoxin, toxemia, toxicology, toxiglossa
trache- (windpipe) tube trachea, tracheal, tracheitis, tracheostomy
tracho- hair, thread, filament trichocyst, trachoma, trachytic, trachyte
-tract- pull, drag, draw attract, tractor, traction, extract, retract, protract
trans- across, over, beyond transmit, transport, transaction, transducer, transoceanic
translocation, transfer, transpose, transference
trapez- four-footed, table trapeze, trapezium, trapezoid
trama- wound, injury traumatic, traumatize, traumatropism
tri- three, having three tripod, triglyceride, triploid, tricolor, triptych, triangle
parts tricuspid, triceps, triceratops, trichromic, trinity, tripod
-tribu- press, tribe, assembly tribune, tribulation, tribunal, retribution
trich- hair, thread, filament trichinid, trichinosis, trichite, schizotrichia, trichotomy
-tripsy crushing lithotripsy,
trit- rub, worn, frayed trite, trituration, triturate, triturator
trocha- wheel, runner, to run trochelminth, trochanter, trochilus, trochlea, trochoid
-trope turn toward tropism, phototrophic, geotropism, hydrotropism, trope
-troph feeding, fed, to eat trophic level, autotroph, heterotroph, trophoblast, trophallaxis
-tropism movement or growth in phototropism, geotropism, hydrotropism, thermotropism,
response to a stimulus thigmotropism
-trophy development, nutrition atrophy, dystrophy, trophy
-trud thrust extrude, protrude, intrude, protrusive
trunc- maimed truncate, truncheon, truncated
trypan- borer trypanosome, trypanosomiasis, trypanosoma
tuber- a swelling tuberculosis, protuberant, tubercle, tuberosity
-turb- mob, crowd, muddled turbid, disturb, turbulent
turgid swell turgor, turgidity, turgescent, turgent
twi- two twin, twilight, twice
-ty condition, state of quality, reality
tympan(o)- eardrum, drum tympanic membrane, tympany, tympanum
-typ- style, print type, typography, prototype, atypical

PRS MEANING EXAMPLE WORDS

U
Select another letter.

-ular of, resembling cellular, tubular, singular
-ule small grandule, tubule, vestibule, module
uln- ulna (lower arm) ulna, ulnar, ulnad, ulnaris, ulnoradial
ulti- beyond ultimate, ulterior, ultima, ultimatum
ultra- excessive, extreme ultraviolet, ultrasonic, ultraconservative, ultramarine
ulul- howl ululant, ululation, ululate
umbilic- navel umbilicate, umbical
-umbra- shade, shadow umbrella, umbrage, penumbra, umbral, umbriferous
-un- not, opposite uncooked, unharmed, unintended, unconstitutional
under- below, incompletely undercook, underestimate, underage
up- higher upscale, upgrade, update, upheld
undu- a wave undulate, inundate, undulation, unde
ungu- nail, hoof, claw ungulate, ungula, unguis, ungual
uni- one, single unicorn, unicycle, union, unisexual, unilateral, uniped,
unipolar, unicellular, united, uniform,
urb- city urban, suburbs, urbane, urbis
-ura(o)- tail urochordate, uropygial, uropygidium
-ure act, process, condition erasure, judicature, legislature
uro- urine uric, urine, urinal, urology, urochord, urethane, urea
ur- first, original urtext, urheimat
ursa- a she-bear ursa, ursine, ursula, ursiform
urtica- nettle, burn urticarial, urticating, urticaceous
usti(u)- scorch, burn ustion, ustulate, ustulation
uter- uterus, womb uterus, uterotomy, uteroplacental
uti- fit for use utilize, utensil, utility
usu- use usual, usury, usufruct, usurp

PRS MEANING EXAMPLE WORDS

V
Select another letter.

vacan- empty, quiet vacant, vacancy, vacate, vacation, evacuate
vacc- cow vaccine, vaccinal, vaccination
vacill- waver, fluctuate vacillate, vacillation, vacillatory
vacu- hole, cavity vacuole, vacuous, vacuity, vaccum
-vade to go invade, invasion, evade, invader
vaga- wandering vagus nerve, vagabond, vagrant, vagary, vague
vagin- sheath, cup, inward vaginal, invaginate, vulvovaginitis
vain- empty vain, vanity, vanish, vanishing
-vale- value, worth equivalent, valence, invalid, trivalent, valiant, valid
vall- wall vallation
vallus- valley vallecula, vallecular
valv- shell, door valve, bivalave, univalve, valvate, valvulitis
-varicus straddle prevaricate, divaricate, prevarication
vario- change, bent varicella, variant, varicose veins
vas(o)- vessel vasodilator, vascular, vasomotor
-vec-(veh) to carry vector, vehicle, convection, vehement, convey, invected
velo- speed, swift velocimeter, velodrome, velocipede
velum veil, fleece, covering vellus, veliform, velar, velamen, velarium
ven- vein intraveneous, venipuncture, vena cava, venation, venule
venal- sale, mercenary vendor, venal, venality, vendue
venan- to hunt venison, venatical, venatio
ventr(i)- belly, stomach, venter, ventricle, venricular, ventricose
vert- (vers) to turn convert, revert, advertise, versatile, vertigo, invert
vera- true verify, veracious, veracity, verdict
verb- word verbal, verbosity, verbatim, verbalize
verd- green verdant, verdure, verditer, verdigris
-verg to incline converge, diverge, divergent
vermi- worm vermin, vermiform appendix, vermifuge, vermicide
verruc- wart verruca, verrucano, verrucose
-vers- turn, different reverse, obverse, transverse, diversely,
direction versatile, universe, version
-vert- to change, turn revert, invert, convert, divert, vertex
vesic- bladder, blister vesicant, vesicoclysis, vesicle, vesicant, vesiculator
-vest- garment, robe vest, vestment, invest, divest, vestry
vestib- cavity, entrance vestibule, vestibular, vestibulotomy
vestig- trace, footstep vestige, vestigial, investigate
via- road, way viaduct, deviate, viatic, viagraph, devious
vibr- shake, vibrate vibrant, vibrato, vibrissa, vibraculum
vice- in place of vicarious, vicar, viceroy, viscarage
vin- wine, grape vineyard, vintage, vinegar, vinic, vinegerone
-vious characterized by obvious, envious
vir- virus, slime, ooze virulence, virus, virology, virulent
virg- slender as a rod virgate, virgulate, virga, virgin
vis- see vision, visor, visage,
viscero- internal organs visceral, viscera, visceroptosis
vit(a)- life vital, vitality, vitamins, revitalize
vivi- live, alive viable, revive, vivacious, vivid, vivipara, vivagious
vitr(e)- glass vitreous, vitriform, vitrify, in vitro
vitu- fault vituperate, vitiate, vitiation
-voc- call vocal, revoke, invoke, vocation, vociferate
vola- to fly volant, volatile, volplane, volery
-voli, volo- will volition, malevolent, volitive, volunteer
volt- turn volti, voluble, revolt, voltigeur
-volv- roll involve, revolve, evolve, devolve, involute, convolution
-vor(e)- eat, feed, devour carnivore, herbivore, omnivore, detritivore, voracious
vot- to vow votive, votary, vote, devoted
-vuln- attack, wound vuln, vulnerable, invulnerable, vulnerability
vulp- fox, cunning vulpine, vulpecular, vulpicide

PRS MEANING EXAMPLE WORDS

W
Select another letter.

-ward in the direction of skyward, inward, downward, outward, southward
-where location everywhere, nowhere, anywhere, somewhere
-wise direction clockwise, otherwise, profitwise, saleswise
with- together, united withhold, withstand, without, within

X
Select another letter.

xanth(o)- yellow xanthophyll, xanthine, xanthophane
xen(o)- stranger, foreigner xenolith, xenogamy, xenophobia
xer(o)- dry, dryness xeric, xerophyte, xeroderma, xerography
xiph- sword shaped xiphoid, xiphoiditis, xiphisternum, xiphiplastron
xylo- wood xylum, xylograph, xylene, xylophone
xys- file, scrape xyst, xysma, xyster

Y
Select another letter.

-y condition, quality of runny, messy, summary, chilly, sleepy
-yne ending for alkynes

PRS MEANING EXAMPLE WORDS

Z
Select another letter.

zeo- boil zeolite, zeoscope, zeolitic, zeocarbon
-zo- animal protozoan, zoology, zooplankton, zoospore, holozoic,
zoomorphic, zoo, Zodiac, zoophyte
zon- girdle, belt zone, zonary, zoned, zonate, zonal
-zygo- united, pair, yoke, tied zygote, zygospore, heterozygous, zygodactyl, zygosis,
together, articulation zygomatic arch
zym- causing to ferment enzyme, zymogen, zymometer, zymotic