| OAK | Kjer optic atrophy |
|---|---|
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| OG | obstetrics and gynecology; occlusogingival; oligodendrocyte; optic ganglion; orange green; orogastri... |
| OOA | outer optic anlage |
| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |