| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
|---|---|
| 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... |
| HPF, hpf | High Power Field; 고배율 시야 |