| IOV | inside-out vesicle |
|---|---|
| KO | keep on; keep open; killed organism; knee orthosis; knock out |
| LIFO | last in, first out |
| OD | Doctor of Optometry; obtained absorbance; occipital dysplasia; occupational dermatitis; occupational... |
| OE | on examination; order entry [system]; orofacial cleft; orthopedic examination; otitis externa; out-s... |