| NO | narcotics officer; nitric or nitrous oxide; none obtained; nonobese; nurse's office |
|---|---|
| NOS | network operating system; nitric oxide synthetase; non-organ-specific; not on staff; not otherwise s... |
| 4NQO | 4-nitroquinoline 1-oxide |
| OX | optic chiasma; oxacillin; oxalate; oxide; orthopedic examination; oxytocin |
| ZnOE | zinc oxide and eugenol |