| OAR | organ at risk |
|---|---|
| PNMR | postnatal mortality risk |
| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
| RM | radical mastectomy; random migration; radon monitor; range of movement; red marrow; reference materi... |
| RRC | residency review committee; risk reduction component; routine respiratory care; Royal Red Cross; rur... |