| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| MChOrth | Master of Orthopaedic Surgery |
| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
| BOA | born on arrival; British Orthopaedic Association |
| COA | Canadian Ophthalmological Association; Canadian Orthopaedic Association; certificate of authority; c... |