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VERY Common Abbr.
Commonly Encountered Abbreviations O's
| Term | Definition |
|---|---|
| Oe | oxygen |
| OA | osteoarthritis |
| OB | obstetrics |
| OC | oral contraceptive |
| od | once a day |
| OHS | open heart surgery |
| OR | operating room |
| Ortho | orthopedics, orthopaedics |
| OS | left eye (oculus sinister) |
| os | mouth |
| OT | occupational therapy (or therapist) |
| Oto | otology |
| O2, OU | both eyes (oculus unitas) |
| OU | each eye (oculus uterque) |
| Oz | ounce |