| MARC | machine-readable cataloging; multifocal and recurrent choroidopathy |
|---|---|
| NERD | no evidence of recurrent disease |
| RAP | recurrent abdominal pain; regression-associated protein; renal artery pressure; resident assessment ... |
| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
| RBD | recurrent brief depression; relative biological dose; right border of dullness |