| Orn | ornithine |
|---|---|
| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |
| OTA | occupational therapy assistant; Office of Technology Assessment; ornithine transaminase; orthotoluid... |
| OTC | ornithine transcarbamylase; oval target cell; over-the-counter; oxytetracycline |
| OTCD | ornithine carbomoyltransferase deficiency |