| OU | Oculus Uterque; Each Eyes, Both Eyes; 두눈 다 |
|---|---|
| EC | effective concentration; ejection click; electrochemical; electron capture; embryonal carcinoma; eme... |
| EO | eosinophil; ethylene oxide; eyes open |
| HEENT | head, ears, eyes, nose, and throat |
| O2 | both eyes; diatomic oxygen; molecular oxygen |