| AU | Auris Uterque; Both Ears |
|---|---|
| AU | according to custom [Lat. ad usum]; allergenic unit; ngstrom unit; antitoxin unit; arbitrary unit; Australia antigen; azauridine |
| Au | Australia [antigen]; authorization; gold [Lat. aurum] |
| Au | Ag Australia antigen |
| AUA | American Urological Association; asymptomatic urinary abnormalities |
| AUB | abnormal uterine bleeding |
| AUC | area under the curve |
| AUD | arthritis of unknown diagnosis |
| aud | auditory |
| aud-vis | audiovisual |