| OI | obturator internus; occasional insomnia; opportunistic infection; opsonic index; orgasmic impairment... |
|---|---|
| OIC | osteogenesis imperfecta congenita |
| OIF | observed intrinsic frequency; oil immersion field; Osteogenesis Imperfecta Foundation |
| LASER | Light Amplication by Stimulated Emission of Radiation |
| BSSE | bile salt-stimulated esterase |