| MO | macroorchidism; manually operated; Master of Obstetrics; Master of Osteopathy; medical officer; mesi... |
|---|---|
| MO-MOM | mineral oil and milk of magnesia |
| OEF | oil immersion field; oxygen extraction fraction |
| OIF | observed intrinsic frequency; oil immersion field; Osteogenesis Imperfecta Foundation |
| ol | oliv olive oil [Lat. oleum olivea] |