List of Greek and Latin roots in English/R

R

Root Meaning in English Origin language Etymology (root origin) English examples rad-, ras- scrape, shave Latin , abrade, abrasion, abrasive, corrade, corrasion, erase, erasure, nonabrasive, radula, radular, raduliform, rase, rash, rasorial, raster, rasure, subradular radi- beam, spoke Latin , radiance, radiation radic- root Latin , eradicate, radical, radix ram- branch Latin ramification, rammel, ramose, ramous, ramulose, ramulous ran- frog Latin Rana ranc- rancidness, grudge, bitterness Latin rancid, rancor rap- rob, seize Latin , arreption, arreptitious, enrapt, enrapture, rapacious, rapacity, rape, rapid, rapidity, rapine, rapt, raptio, raptor, raptorial, rapture, rapturous, raptus, ravenous, ravine, ravish, subreption, subreptitious, surreptitious rap- turnip Latin rapeseed raph- sew, seam Greek (), () raphae, raphe rar- rare Latin rarity rauc- harsh, hoarse Latin raucous re-, red- again, back Latin recede, redact rect-, reg-, -rig- straight, direct Latin "to direct, lead straight, guide", related "straight, right" correct, direct, dirigible, erect, erection, ergo, rectangle, rectify, rectitude, rectum, regent, regime, regimen, regiment, region, surge reg-, rex- king Latin (genitive ) regal, regency, regicide, Regis, regulation, reign, rex, royal regul- rule Latin "to rule" regular, regulate, regulation, rule rem- oar Latin bireme, trireme ren- kidney Latin renal rep-, rept- crawl, creep Latin , reptile resid- left behind Latin "remain behind" (see also sedere) reside, residence, resident, residual, residue ret- net Latin reticle, retina retro- backward, behind Latin retrograde, retrospective, retrovirus rhabd- rod Greek () Rhabdodon, rhabdoid, rhabdom, rhabdomancy, rhabdomyolysis, rhabdomyosarcoma rhach-, rach- spine Greek () rachipagus, rachis, rachischisis, rhachiodont, rhachis rhag-, rheg- rend, tear Greek (), , (), () bronchorrhagia, hemorrhage, menorrhagia, regma, rhagades, rhegma, rhegmatogenous, rhexis rhe- flow Greek (), (), (), (), (), () antiarrhythmic, arrhythmia, arrhythmic, diarrhoea, dysrhythmia, endorheic, eurhythmia, eurhythmic, eurhythmy, gonorrhoea, hemorrhea, logorrhea, polyrhythm, rheology, rheometer, rheostat, rheum, rheumatic, rheumatism, rheumatoid, rheumatology, rhythm, rhythmic, rhyton rhetin- resin Greek (), , retinite rhig- chill Greek () rhigosaurus rhin- nose, snout Greek () catarrhine, haplorhine, platyrrhine, rhinoceros, rhinophyma, rhinoplasty, strepsirrhine rhiz- root Greek (), (), () ectomycorrhiza, rhizoid, rhizomatous, rhizome, rhizomorph, rhizomorphous, rhizophagous, rhizophagy, Rhizopogon, Rhizopus, rhizosphere rho- R, r Greek , () rho, rhotacism, rhotacize, rhotic rhod- rose Greek () rhododendron, rhodophyte, rhodopsin, rhodophobia rhomb- spinning top Greek () orthorhombic, rhomb, rhombic, rhomboid, rhombus, rhumb rhynch- snout Greek () Oncorhynchus, Rhynchobatus, rhynchophore rid-, ris- laugh Latin "to laugh" (past participle risus) deride, derision, ridicule, ridiculous, risible robor- oak, strength Latin "to strengthen", from , "strength" corroborant, corroborate, corroboration, corroborative, corroborator, robust rod-, ros- gnaw Latin , corrode, erosion, rodent rog- ask Latin abrogate, arrogant, arrogate, derogate, derogation, derogatory, interrogation, prerogative, prorogue, rogation, rogue, surrogate rostr- beak, prow Latin brevirostrate, curvirostral, lamellirostral, rostellate, rostelliform, rostellum, rostral, rostrate, rostriform, rostrulum, rostrum rot- wheel Latin , arrondissement, circumrotation, contrarotation, control, controller, decontrol, enroll, enrollee, enrollment, irrotational, multirole, multiroll, redondilla, reenroll, rodeo, role, roll, rondeau, rondel, rondelle, rondo, rotary, rotate, rotation, rotational, rotator, rotatory, rotavirus, rotelle, rotifer, Rotifera, rotiferous, rotiform, rotula, rotund, rotunda, rotundifolious, rotundity, roulette, round, roundel, roundelay, roundlet, rowel, semiround ruber-, rubr- red Latin erubescence, erubescent, rubella, Rubio, rubious, rubric, rubricate, rubrication, rubricator, ruby rudi- unskilled, rough, unlearned Latin erudite, erudition, rude, rudiment, rudimentary, rudity rug- wrinkle Latin , corrugant, corrugate, corrugation, erugate, rugose rumin- throat Latin , rumen, rumenic acid, ruminal, ruminant, ruminate, rumination, ruminator rump-, rupt- break, burst Latin , abrupt, abruption, corrupt, corruptible, corruption, corruptor, disrupt, disruption, disruptive, disruptor, disrupture, erumpent, erupt, eruption, eruptive, incorrupt, incorruptibility, incorruptible, interrupt, interruptible, interruption, irrupt, irruption, irruptive, maleruption, noneruptive, reroute, rout, route, routine, rupture, subroutine, supereruption rur- countryside, farm Latin , nonrural, roister, roisterous, rural, rustic, rusticate, rustication, rusticity References