| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| ECD | ectrodactyly; electrochemical detector; electron capture detector; endocardial cushion defect; enzym... |
| enz | enzyme, enzymatic |
| OCP | octacalcium phosphate; ocular cicatricial pemphigoid; oral case presentation; oral contraceptive pil... |
| OET | oral endotracheal tube; oral esophageal tube |