| Abbreviation | Definition |
|---|---|
| OTOH | On the other hand |
| OU | Oculi Uterque (both Eyes) |
| OV | Each Eye |
| OVC | Ohio Valley Center for Brain Injury Prevention and Rehabilitation |
| OVCBIPR | Ohio Valley Center for Brain Injury Prevention and Rehabilitation |
| OVH | OVario-Hysterectomy |
| OVX | OVariectomize |
| OWG | Osteoporosis Working Group |
| OWM | Ostomy Wound Management |
| OXG | Organ- Xenograft- Grade |
| OXG | Oxide- Rich Gabbro |
| OXY | Oxycontin |
| OXYCOD | Oxycodone Hydrochloride |
| OXYCODTER | Oxycodone Terephthalate |
| P | Pain |
| P | Parainfluenza |
| P | Paralysis |
| P | Pathology |
| P | Penetration |
| P | Penis |