# List of Greek and Latin roots in English/R

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## R

| Root | Meaning in English | Origin language | Etymology (root origin) | English examples |
| rad-, ras- | scrape, shave | Latin | rādere, rāsus | abrade, abrasion, abrasive, corrade, corrasion, erase, erasure, nonabrasive, radula, radular, raduliform, rase, rash, rasorial, raster, rasure, subradular |
| radi- | beam, spoke | Latin | radius, radiāre | radiance, radiation |
| radic- | root | Latin | rādix, rādīcis | eradicate, radical, radix |
| ram- | branch | Latin | rāmus | ramification, rammel, ramose, ramous, ramulose, ramulous |
| ran- | frog | Latin | rāna | Rana |
| ranc- | rancidness, grudge, bitterness | Latin | rancere | rancid, rancor |
| rap- | rob, seize | Latin | rapere, raptus | 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 | rāpum | rapeseed |
| raph- | sew, seam | Greek | ῥάπτειν (rháptein), ῤαφή (raphḗ) | raphae, raphe |
| rar- | rare | Latin | rārus | rarity |
| rauc- | harsh, hoarse | Latin | raucus | raucous |
| re-, red- | again, back | Latin | re- | recede, redact |
| rect-, reg-, -rig- | straight, direct | Latin | regere "to direct, lead straight, guide", related rectus "straight, right" | correct, direct, dirigible, erect, erection, ergo, rectangle, rectify, rectitude, rectum, regent, regime, regimen, regiment, region, surge |
| reg-, rex- | king | Latin | rex (genitive regis) | regal, regency, regicide, Regis, regulation, reign, rex, royal |
| regul- | rule | Latin | rēgula "to rule" | regular, regulate, regulation, rule |
| rem- | oar | Latin | rēmus | bireme, trireme |
| ren- | kidney | Latin | rēnēs | renal |
| rep-, rept- | crawl, creep | Latin | rēpere, reptus | reptile |
| resid- | left behind | Latin | residere "remain behind" (see also sedere) | reside, residence, resident, residual, residue |
| ret- | net | Latin | rēte | reticle, retina |
| retro- | backward, behind | Latin | retrō | retrograde, retrospective, retrovirus |
| rhabd- | rod | Greek | ῥάβδος (rhábdos) | Rhabdodon, rhabdoid, rhabdom, rhabdomancy, rhabdomyolysis, rhabdomyosarcoma |
| rhach-, rach- | spine | Greek | ῥάχις, ῥάχεως (rhákhis, rhákheōs) | rachipagus, rachis, rachischisis, rhachiodont, rhachis |
| rhag-, rheg- | rend, tear | Greek | ῥηγνύναι (rhēgnúnai), ῥαγίζω, ῥῆξις (rhêxis), ῥῆγμα (rhêgma) | bronchorrhagia, hemorrhage, menorrhagia, regma, rhagades, rhegma, rhegmatogenous, rhexis |
| rhe- | flow | Greek | ῥεῖν (rheîn), ῥυτός (rhutós), ῥύσις (rhúsis), ῥεῦμα (rheûma), ῥοία (rhoía), ῥυθμός (rhuthmós) | 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 | ῥητίνη (rhētínē), ῥητινώδης, ῥητινόω | retinite |
| rhig- | chill | Greek | ῥῖγος (rhîgos) | rhigosaurus |
| rhin- | nose, snout | Greek | ῥίς, ῥινός (rhís, rhinós) | catarrhine, haplorhine, platyrrhine, rhinoceros, rhinophyma, rhinoplasty, strepsirrhine |
| rhiz- | root | Greek | ῥίζα (rhíza), ῥιζοῦν (rhizoûn), ῥίζωμα (rhízōma) | ectomycorrhiza, rhizoid, rhizomatous, rhizome, rhizomorph, rhizomorphous, rhizophagous, rhizophagy, Rhizopogon, Rhizopus, rhizosphere |
| rho- | R, r | Greek | Ρ, ρ, ῥῶ (rhô) | rho, rhotacism, rhotacize, rhotic |
| rhod- | rose | Greek | ῥόδον (rhódon) | rhododendron, rhodophyte, rhodopsin, rhodophobia |
| rhomb- | spinning top | Greek | ῥόμβος (rhómbos) | orthorhombic, rhomb, rhombic, rhomboid, rhombus, rhumb |
| rhynch- | snout | Greek | ῥύγχος (rhúnkhos) | Oncorhynchus, Rhynchobatus, rhynchophore |
| rid-, ris- | laugh | Latin | ridere "to laugh" (past participle risus) | deride, derision, ridicule, ridiculous, risible |
| robor- | oak, strength | Latin | rōborāre "to strengthen", from rōbur, rōbus "strength" | corroborant, corroborate, corroboration, corroborative, corroborator, robust |
| rod-, ros- | gnaw | Latin | rōdere, rōsus | corrode, erosion, rodent |
| rog- | ask | Latin | rogāre | abrogate, arrogant, arrogate, derogate, derogation, derogatory, interrogation, prerogative, prorogue, rogation, rogue, surrogate |
| rostr- | beak, prow | Latin | rōstrum | brevirostrate, curvirostral, lamellirostral, rostellate, rostelliform, rostellum, rostral, rostrate, rostriform, rostrulum, rostrum |
| rot- | wheel | Latin | rota, rotāre | 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 | ruber | erubescence, erubescent, rubella, Rubio, rubious, rubric, rubricate, rubrication, rubricator, ruby |
| rudi- | unskilled, rough, unlearned | Latin | rudis | erudite, erudition, rude, rudiment, rudimentary, rudity |
| rug- | wrinkle | Latin | rūga, rugare | corrugant, corrugate, corrugation, erugate, rugose |
| rumin- | throat | Latin | rūmen, rūminis | rumen, rumenic acid, ruminal, ruminant, ruminate, rumination, ruminator |
| rump-, rupt- | break, burst | Latin | rumpere, ruptus | 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 | rūs, rūris | nonrural, roister, roisterous, rural, rustic, rusticate, rustication, rusticity |