| AA | abdominal aorta; acetic acid; achievement age; active alcoholic; active assistive [range of motion];... |
|---|---|
| AU | according to custom [Lat. ad usum]; allergenic unit; ngstrom unit; antitoxin unit; arbitrary unit; A... |
| Au | Australia [antigen]; authorization; gold [Lat. aurum] |
| Au | Ag Australia antigen |
| AuHAA | Australia hepatitis-associated antigen |