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- 're (right) under someone's nose (right) up/down someone's alley -rachidia -rhina -rhine -rhinus -rhiza -rhynchus -rrhachis -rrhagia -rrhaphy -rrhea -rrhexes -rrhoea -ry R & B R & D R & R R acid R and B R and C R and CC R and D R and L R and R R and W R factor R month R salt R star R-rated R-value
- RAAF RADM RAF RAM disk RATO RBC RBH RBI RC RCAF RCG RCL RCM RCMP RCN RDA RDC RDF RDX RDY REA REIT REM sleep RF station RFB RFC RFD RFID RFLP RFP RGB RHB RHI
- RHIP RHQ RHS RI RIA RICO RIE RIF RISC RJ RKVA RL RL and R RLO RMI RNA RNA interference RNA polymerase RNA virus RNAase RNAi RNC ROG ROI ROK ROTC RP RPC RPG RPO RPP RPT RPV