| OAF | Osteoclast Activating Factor |
|---|---|
| OAF | open air factor; osteoclast activating factor |
| OAG | open angle glaucoma |
| OAH | ovarian androgenic hyperfunction |
| OAISO | overaction of the ipsilateral superior oblique |
| OAK | Kjer optic atrophy |
| OALF | organic acid labile fluid |
| OALL | ossification of anterior longitudinal ligament |
| OAM | outer acrosomal membrane |
| OAP | Office of Adolescent Pregnancy; old age pension, old age pensioner; ophthalmic artery pressure; osteoarthropathy; oxygen at atmospheric pressure; precocious osteoarthrosis |