| RBD | recurrent brief depression; relative biological dose; right border of dullness |
|---|---|
| RCDA | recurrent chronic dissecting aneurysm |
| rec | fresh [Lat. recens]; recessive; recombinant chromosome; record; recovery; recurrence, recurrent |
| recur | recurrence, recurrent |
| RFP | recurrent facial paralysis; request for proposal; right frontoposterior [fetal position] |