| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| COPD | Chronic Obstructive Pulmonary Disease; 만성 폐쇄성 폐질환 |
| COPD | chronic obstructive pulmonary disease |
| OCP | octacalcium phosphate; ocular cicatricial pemphigoid; oral case presentation; oral contraceptive pil... |
| OET | oral endotracheal tube; oral esophageal tube |