| aI | active ingredient |
|---|---|
| AI-CAH | autoimmune-type chronic active hepatitis |
| ALE | active life expectancy; allowable limits of error; amputated lower extremity |
| 'Greek letter alpha' | angular acceleration; first [carbon atom next to the carbon atom bearing the active group in organic... |
| AP | accessory pathway; accounts payable; acid phosphatase; acinar parenchyma; action potential; active p... |