| ORD | optical rotatory dispersion; oral radiation death |
|---|---|
| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
| BMD | Bone Mineral Density |
| HD | 1) Hodgkin's Disease 2) Hemo-Dialysis 3) High Density &... |
| HDL | High Density Lipoprotein; 고밀도 지질 단백질 |