| 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 |
| ZOE | zinc oxide-eugenol |