| AO | abdominal aorta; achievement orientation; acid output; acridine orange; ankle orthosis; anodal openi... |
|---|---|
| DOA | date of admission; dead on arrival; Department of Agriculture; depth of anesthesia; differential opt... |
| IOD | injured on duty; integrated optical density; interorbital distance |
| MORD | magnetic optical rotatory dispersion |
| OCR | oculocardiac reflex; oculocerebrorenal [syndrome]; optical character recognition |