| OI | obturator internus; occasional insomnia; opportunistic infection; opsonic index; orgasmic impairment... |
|---|---|
| AIS | Androgen Insensitive Syndrome = Testicular Feminization Syndrome |
| AA | abdominal aorta; acetic acid; achievement age; active alcoholic; active assistive [range of motion];... |
| AACSH | adrenal androgen corticotropic stimulating hormone |
| AASH | adrenal androgen stimulating hormone; American Association for the Study of Headache |