| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| WHO ORS | World Health Organization Oral Rehydration Solution osmolality 330; 세계보건기구 경구 수액 용액 |
| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |
| CT | calcitonin; calf testis; cardiac tamponade; cardiothoracic [ratio]; carotid tracing; carpal tunnel; ... |