| NOVS | National Office of Vital Statistics |
|---|---|
| OAP | Office of Adolescent Pregnancy; old age pension, old age pensioner; ophthalmic artery pressure; oste... |
| OAPP | Office of Adolescent Pregnancy Programs |
| OBE | Office of Biological Education |
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |