| OCD | obsessive compulsive disorder; Office of Child Development; Office of Civil Defense; osteochondritis... |
|---|---|
| OGF | ovarian growth factor; oxygen gain factor |
| OHS | obesity hypoventilation syndrome; occipital Horn syndrome; occupational health service; ocular histo... |
| OHSS | ovarian hyperstimulation syndrome |
| OPSA | ovarian papillary serous adenocarcinoma |