| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| OAS | old age security; oral allergy syndrome; osmotically active substance |
| PCM | Protein Calorie Malnutrition = PEM |
| PEM | Protein-Energy Malnutrition = PCM; Protein Calorie Malnutrition |
| PCM | patient care manager or management; patient classification system; primary cutaneous melanoma; proce... |