radius | beam, spoke | | radi- | radius, radiāre | radiance, radiation |
rancere | rancidness, grudge, bitterness | | ranc- | rancere | rancid, rancor |
rapere | rob, seize | | rap- | 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 |
raucus | harsh, hoarse | | rauc- | raucus | raucous |
re- | again, back | | re-, red- | re- | recede, redact |
regere | straight, direct | | rect-, reg-, -rig- | 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 |
residere | left behind | | resid- | residere remain behind (see also sedere) | reside, residence, resident, residual, residue |
retrō | backward, behind | | retro- | retrō | retrograde, retrospective, retrovirus |
rex | king | | reg-, rex- | rex (genitive regis) | regal, regency, regicide, Regis, regulation, reign, rex, royal |
ridere | laugh | | rid-, ris- | ridere to laugh (past participle risus) | deride, derision, ridicule, ridiculous, risible |
rogāre | ask | | rog- | rogāre | abrogate, arrogant, arrogate, derogate, derogation, derogatory, interrogation, prerogative, prorogue, rogation, rogue, surrogate |
rota | wheel | | rot- | 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 | red | | ruber-, rubr- | ruber | erubescence, erubescent, rubella, Rubio, rubious, rubric, rubricate, rubrication, rubricator, ruby |
rudis | unskilled, rough, unlearned | | rudi- | rudis | erudite, erudition, rude, rudiment, rudimentary, rudity |
rumpere | break, burst | | rump-, rupt- | 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 |
rāder | scrape, shave | | rad-, ras- | rādere, rāsus | abrade, abrasion, abrasive, corrade, corrasion, erase, erasure, nonabrasive, radula, radular, raduliform, rase, rash, rasorial, raster, rasure, subradular |
rādix | root | | radic- | rādix, rādīcis | eradicate, radical, radix |
rāmus | branch | | ram- | rāmus | ramification, rammel, ramose, ramous, ramulose, ramulous |
rāna | frog | | ran- | rāna | Rana |
rāpum | turnip | | rap- | rāpum | rapeseed |
rārus | rare | | rar- | rārus | rarity |
rēgula | rule | | regul- | rēgula to rule | regular, regulate, regulation, rule |
rēmus | oar | | rem- | rēmus | bireme, trireme |
rēnēs | kidney | | ren- | rēnēs | renal |
rēpere | crawl, creep | | rep-, rept- | rēpere, reptus | reptile |
rēte | net | | ret- | rēte | reticle, retina |
rōborāre | oak, strength | | robor- | rōborāre to strengthen, from rōbur, rōbus strength | corroborant, corroborate, corroboration, corroborative, corroborator, robust |
rōdere | gnaw | | rod-, ros- | rōdere, rōsus | corrode, erosion, rodent |
rōstrum | beak, prow | | rostr- | rōstrum | brevirostrate, curvirostral, lamellirostral, rostellate, rostelliform, rostellum, rostral, rostrate, rostriform, rostrulum, rostrum |
rūga | wrinkle | | rug- | rūga, rugare | corrugant, corrugate, corrugation, erugate, rugose |
rūmen | throat | | rumin- | rūmen, rūminis | rumen, rumenic acid, ruminal, ruminant, ruminate, rumination, ruminator |
rūs | countryside, farm | | rur- | rūs, rūris | nonrural, roister, roisterous, rural, rustic, rusticate, rustication, rusticity |