| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
|---|---|
| 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... |
| BOD | Biochemical Oxygen Demand; 생물학적 산소 요구량 ; 1 L 수중의 유기물을 Bacteria 가 20 ℃에서 5일간 분해하는데 소비... |