| ODS | organized delivery system; osmotic demyelination syndrome |
|---|---|
| OEE | osmotic erythrocyte enrichment; outer enamel epithelium |
| OER | osmotic erythrocyte [enrichment]; oxygen enhancement ratio |
| OF | occipitofrontal; open field [test]; optical fundus; orbitofrontal; osmotic fragility; osteitis fibro... |
| OP | occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pre... |