| OFD | object-film distance; occipital frontal diameter; oro-facial-digital [syndrome] |
|---|---|
| ORO | oil red O |
| PT | Rep patient's representative |
| REP | replication protein; rest-exercise program; retrograde pyelogram; roentgen equivalent-physical |
| rep | let it be repeated [Lat. repetatur]; replication; roentgen equivalent-physical |