| OCD | obsessive compulsive disorder; Office of Child Development; Office of Civil Defense; osteochondritis... |
|---|---|
| O2D | oxygen delivery |
| ODC | oritidine decarboxylase; ornithine decarboxylase; oxygen dissociation curve |
| OEF | oil immersion field; oxygen extraction fraction |
| OER | osmotic erythrocyte [enrichment]; oxygen enhancement ratio |