| 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 |
| AI | accidental injury; accidentally incurred; adiposity index; aggregation index; allergy and immunology... |
| AIH | amelogenesis imperfecta, hypomaturation type; American Institute of Homeopathy; artificial inseminat... |