| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| PMS | Pre-Menstrual Syndrome |
| PMS | patient management system; perimenstrual syndrome; periodic movements during sleep; phenazine methos... |
| OCP | octacalcium phosphate; ocular cicatricial pemphigoid; oral case presentation; oral contraceptive pil... |
| OET | oral endotracheal tube; oral esophageal tube |