| GOR | gastroesophageal reflux; general operating room |
|---|---|
| MS-DOS | Microsoft Disk Operating System |
| NOS | network operating system; nitric oxide synthetase; non-organ-specific; not on staff; not otherwise s... |
| ONP | operating nursing procedure; orthonitrophenyl |
| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |