| re | back, again | report, realign, retract, revise, regain |
| reg, recti | straighten | regiment, regular, rectify, correct, direct, rectangle |
| retro | backwards | retrorocket, retrospect, retrogression, retroactive |
| ri, ridi, risi | laughter | deride, ridicule, ridiculous, derision, risible |
| rog, roga | ask | prerogative, interrogation, derogatory |
| rupt | break | rupture, interrupt, abrupt, disrupt, ruptible |
| sacr, sanc, secr | sacred | sacred, sacrosanct, sanction, consecrate, desecrate |
| salv, salu | safe, healthy | salvation, salvage, salutation |
| sanct | holy | sanctify, sanctuary, sanction, sanctimonious, sacrosanct |
| sat, satis | enough | satient, saturate, satisfy |
| sci, scio, scientia | know | science, conscious, omniscient, cognocienti |
| scope | see, watch | telescope, microscope, kaleidoscope, periscope, stethoscope |
| scrib, script | write | scribe, scribble, inscribe, describe, subscribe, prescribe, manuscript |
| se | apart, move away from | secede |
| sect, sec | cut | intersect, transect, dissect, secant, section |
| sed, sess, sid | sit | sediment, session, obsession, possess, preside, president, reside, subside |
| semi | half, partial | semifinal, semiconscious, semiannual, semimonthly, semicircle |
| sen, scen | old, grow old | senior, senator, senile, senescence, evanescent |
| sent, sens | feel, think | sentiment, consent, resent, dissent, sentimental, sense, sensation, sensitive, sensory, dissension |
| sept | seven | septet, septennial |
| sequ, secu, sue | follow | sequence, consequence, sequel, subsequent, prosecute, consecutive, second, ensue, pursue |
| serv | save, serve, keep | servant, service, subservient, servitude, preserve, conserve, reservation, deserve, conservation, observe |
| -ship | Noun: status, condition | relationship, friendship |
| sign, signi | sign, mark, seal | signal, signature, design, insignia, significant |
| simil, simul | like, resembling | similar, assimilate, simulate, simulacrum, simultaneous |
| sist, sta, stit | stand, withstand, make up | assist, insist, persist, circumstance, stamina, status, state, static, stable, stationary, substitute |
| soci | to join, companions | sociable, society |
| sol, solus | alone | solo, soliloquy, solitaire, solitude, solitary, isolate |
| solv, solu, solut | loosen, explain | solvent, solve, absolve, resolve, soluble, solution, resolution, resolute, dissolute, absolution |
| somn | sleep | insomnia, somnambulist |
| soph | wise | sophomore (wise fool), philosophy, sophisticated |
| spec, spect, spi, spic | look, see | specimen, specific, spectator, spectacle, aspect, speculate, inspect, respect, prospect, retrospective, introspective, expect, conspicuous |
| sper | render favorable | prosper |
| sphere | ball, sphere | sphere, stratosphere, hemisphere, spheroid |
| spir | breath | spirit, conspire, inspire, aspire, expire, perspire, respiration |
| stand, stant, stab, stat, stan, sti, sta, st, stead | stand | stature, establish, stance |
| -ster | person | mobster, monster |
| strain, strict, string, stige | bind, pull, draw tight | stringent, strict, restrict, constrict, restrain, boa constrictor |
| stru, struct, stroy, stry | build | construe, structure, construct, instruct, obstruct, destruction, destroy, industry, ministry |
| sub, suc, suf, sup, sur, sus | under, below, from, secretly, instead of | sustain, survive, support, suffice, succeed, submerge, submarine, substandard, subnormal, subvert |
| sume, sump | take, use, waste | consume, assume, sump, presumption |
| super, supra | over, above | superior, suprarenal, superscript, supernatural, superimpose, supercede |
| syn, sym | together, at the same time | sympathy, synthesis, synchronous, syndicate |
| tact, tang, tag, tig, ting | touch | tactile, contact, intact, intangible, tangible, contagious, contiguous, contingent |
| tain, ten, tent, tin | hold, keep, have | retain, continue, content, tenacious |
| tect, teg | cover | detect, protect, tegular, tegument |
| tele | distance, far, from afar | telephone, telegraph, telegram, telescope, television, telephoto, telecast, telepathy, telepathy |
| tem, tempo | time | tempo, temporary, extemporaneously, contemporary, pro tem, temporal |
| ten, tin, tain | hold | tenacious, tenant, tenure, untenable, detention, retentive, content, pertinent, continent, obstinate, contain, abstain, pertain, detain |
| tend, tent, tens | stretch, strain | tendency, extend, intend, contend, pretend, superintend, tender, extent, tension, pretense |
| tera | trillion | terabyte, teraflop |
| term | end, boundary, limit | exterminate, terminal |
| terr, terra | earth | terrain, terrarium, territory, terrestrial |
| test | to bear witness | testament, detest, testimony, attest, testify |
| the, theo | God, a god | monotheism, polytheism, atheism, theology |
| therm | heat | thermometer, theorem, thermal, thermos bottle, thermostat, hypothermia |
| thesis, thet | place, put | antithesis, hypothesis, synthesis, epithet |
| tire | draw, pull | attire, retire, entire |
| tom | cut | atom (not cutable), appendectomy, tonsillectomy, dichotomy, anatomy |
| tor, tors, tort | twist | torture, retort, extort, distort, contort, torsion, tortuous, torturous |
| tox | poison | toxic, intoxicate, antitoxin |
| tract, tra, trai, treat | drag, draw, pull | attract, tractor, traction, extract, retract, protract, detract, subtract, contract, intractable |
| trans | across, beyond, change | transform, transoceanic, transmit, transportation, transducer |
| tri | three | tripod, triangle, trinity, trilateral |
| trib | pay, bestow | tribute, contribute, attribute, retribution, tributary |
| tribute | give | contribute, distribute, tributary |
| turbo | disturb | turbulent, disturb, turbid, turmoil |
| typ | type, prototype, typical, typography, typewriter, typology, typify | |
| ultima | last | ultimate, ultimatum |
| umber, umbraticum | shadow | umbra, penumbra, (take) umbrage, adumbrate |
| un | not, against, opposite | unceasing, unequal |
| uni | one | uniform, unilateral, universal, unity, unanimous, unite, unison, unicorn |
| -ure | Noun: act, condition, process, function | exposure, conjecture, measure |
| vac | empty | vacate, vacuum, evacuate, vacation, vacant, vacuous |
| vade | go | evade, invader |
| vale, vali, valu | strength, worth | equivalent, valiant, validity, evaluate, value, valor |
| veh, vect | to carry | vector, vehicle, convection, vehement |
| ven, vent | come | convene, intervene, venue, convenient, avenue, circumvent, invent, convent, venture, event, advent, prevent |
| ver, veri | true | very, aver, verdict, verity, verify, verisimilitude |
| verb, verv | word | verify, veracity, verbalize, verve |
| vert, vers | turn, change | convert, revert, advertise, versatile, vertigo, invert, reversion, extravert, introvert, diversion, introvert, convertible, reverse, controversy |
| vi | way | viable, vibrate, vibrant |
| vic, vicis | change, substitute | vicarious, vicar, vicissitude |
| vict, vinc | conquer | victor, evict, convict, convince, invincible |
| vid, vis | see | video, evident, provide, providence, visible, revise, supervise, vista, visit, vision, review, indivisible |
| viv, vita, vivi | alive, life | revive, survive, vivid, vivacious, vitality, vivisection, vital, vitamins, revitalize |
| voc, voke | call | vocation, avocation, convocation, invocation, evoke, provoke, revoke, advocate, provocative, vocal |
| vol | will | malevolent, benevolent, volunteer, volition |
| volcan | fire | volcano, vulcanize, Vulcan |
| volv, volt, vol | turn about, roll | revolve, voluble, voluminous, convolution, revolt, evolution |
| vor | eat greedily | voracious, carnivorous, herbivorous, omnivorous, devour |
| -ward | Adverb: in a direction or manner | homeward |
| -wise | Adverb: in the manner of, with regard to | timewise, clockwise, bitwise |
| with | against | withhold, without, withdraw, forthwith |
| -y | Noun: state, condition, result of an activity | society, victory |
| -y | Adjective: marked by, having | hungry, angry, smeary, teary |
| zo | animal | zoo (zoological garden), zoology, zodiac, protozoan |
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