Greek and Latin roots in English_

Root Meaning in English Origin language Etymology (root origin) English examples
rad-, ras- scrape, shave Latin radere, rasus abrade, abrasion, erasure
radi- beam, spoke Latin radius, radiare radiance, radiation
radic- root Latin rādix, rādīcis eradicate, radical
ram- branch Latin rāmus ramification, ramose
ran- frog Latin ranaR Rana
ranc- rancidness, grudge, bitterness Latin rancere rancid, rancor
rap- rob, seize Latin rapere "to seize, rob" rape, rapacity, raptor, surreptitious
rap- turnip Latin rapum rapeseed
raph- seam Greek ῤαφή (rhaphē) raphe, raphae
rar- rare Latin rarus 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) anorexia, regal, regicide, rex, royal
regul- rule Latin regula "to rule" regular, regulate, regulation, rule
rem- oar Latin remus bireme, trireme
ren- kidney Latin renes renal
reneg- deny Latin renegare renegade, renege
rep-, rept- crawl, creep Latin repere, reptus reptile
ret- net Latin rete reticle, retina
retro- backward, behind Latin retro retrograde, retrospective, retrovirus
rhabd- rod Greek ῥάβδος (rhabdos) rhabdoid, rhabdom
rhach-, rach- spine Greek ῥάχις, ῥάχεως (rhachis) rhachiodont
rhag- tear, rent Greek ῥαγίζω rhagades
rhe- flow Greek ῥεῖν (rhein) rheostat
rhig- chill Greek ῥῖγος (rhigos) rhigosaurus
rhin- nose, snout Greek ῥίς, ῥινός (rhis, rhinos) rhinoceros, rhinoplasty
rhiz- root Greek ῥίζα (rhiza) rhizome
rhod- rose Greek ῥόδον (rhodon) rhododendron
rhomb- spinning top Greek ῥόμβος (rhombos) rhombus
rhynch- snout Greek ῥύγχος Rhynchobatus
rid-, ris- laugh Latin ridere "to laugh" (past participle risus) deride, derision, ridicule, ridiculous, risible
robor- oak, strength Latin roborare "to strengthen", from robur, robus "strength" corroborate, corroboration, robust
rod-, ros- gnaw Latin rodere, rosus corrode, erosion, rodent
rog- ask Latin rogare abrogate, arrogant, arrogate, derogatory, interrogation, prerogative, prorogue, rogation, rogue, surrogate
rostr- beak, prow Latin rostrum rostral, rostriform, rostrum
rot- wheel Latin rota, rotare rotation, rotunda
ruber-, rubr- red Latin ruber rubric, ruby
rudi- unskilled, rough, unlearned Latin rudis erudite, erudition, rude, rudimentary
rug- wrinkle Latin ruga, rugare corrugation
rumin- throat Latin rumen, ruminis rumination
rump-, rupt- break Latin rumpere, ruptus abrupt, corruptible, disrupt, erupt, eruption, interrupt, rupture
rur- country Latin rus, ruris rural