| OET | oral endotracheal tube; oral esophageal tube |
|---|---|
| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
| PAS | 1) Periodic Acid-Schiff Stain 2) Para-Amino-Salicyclic Acid &nbs... |
| POMC | Pro-Opio-Melano-Cortin |
| p.r.n. | pro re nata; as necessary(= needed); 필요시, 필요한만큼 |