| LORF | long open reading frame |
|---|---|
| MIMOSA | medical image management in an open system architecture |
| OAF | open air factor; osteoclast activating factor |
| OAG | open angle glaucoma |
| OCS | occipital condyle syndrome; Ondine's curse syndrome; open canalicular system; oral contraceptive ste... |
| ONTD | open neural tube defect |
|---|---|
| ORF 2 | open reading frame |
| ORF 2 | open reading frame 2 |
| OS | open splenectomy |