| ADN | antideoxyribonuclease; aortic depressor nerve; associate degree in nursing |
|---|---|
| AIN | acute interstitial nephritis; American Institute of Nutrition; anterior interosseous nerve |
| AIPFP | acute idiopathic peripheral facial nerve palsy |
| AIS | Abbreviated Injury Scale; amniotic infection syndrome; androgen insensitivity syndrome; anterior int... |
| ANAS | anastomosis; auditory nerve activating substance |