| ORD | optical rotatory dispersion; oral radiation death |
|---|---|
| PM | after death (Lat. post mortem); after noon [Lat. post meridiem]; mean pressure; pacemaker; pantomogr... |
| PND | paroxysmal nocturnal dyspnea; partial neck dissection; postnasal drainage; postnasal drip; postnatal... |
| POD | peroxidase; place of death; podiatry; polycystic ovary disease; pool of doctors; postoperative day; ... |
| pSIDS | partially unexplained sudden infant death syndrome |