| Abbreviation | Definition |
|---|---|
| OHE | Ovariohysterectomy |
| OHL | Oral Hairy Leukoplakia |
| OHM | Orthomolecular Health Medicine |
| OHN | Occupational Health Nursing |
| OHS | Obesity Hypoventilation Syndrome |
| OHS | Open Heart Surgery |
| OHSS | Ovarian HyperStimulation Syndrome |
| OHZ | OHhrenschmerZ (Ear Pain) |
| OI | Opportunistic Infection |
| OI | Orthopedically Impaired |
| OI | Osteogenesis Imperfecta |
| OID | Other Infant Death |
| OIN | OINtment |
| OJ | Open Jugular |
| OJP | Online Journal of Physiology |
| OJW | Orthodontic Jaw Wiring |
| OKN | Opto-Kinetic Nystagmus |
| OM | Occupational Medicine |
| OM | Osteopathic Manipulation |
| OM | Otitis Media |