| ETH | elixir terpin hydrate; ethanol; ethmoid |
|---|---|
| ETHC | elixir terpin hydrate with codeine |
| OCP | octacalcium phosphate; ocular cicatricial pemphigoid; oral case presentation; oral contraceptive pil... |
| OET | oral endotracheal tube; oral esophageal tube |
| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |