| OCG | omnicardiogram; oral cholecystogram |
|---|---|
| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
| CCG | Children's Cancer Study Group; cholecystogram, cholecystography; clinically coherent group |
| CSG | cholecystography, cholecystogram |
| OCP | octacalcium phosphate; ocular cicatricial pemphigoid; oral case presentation; oral contraceptive pil... |