| AMSAODD | American Medical Society on Alcoholism and Other Drug Dependencies |
|---|---|
| ANS | acanthion; American Nutrition Society; 8-anilino-1-naphthalene-sulfonic acid; anterior nasal spine; ... |
| AOSSM | American Orthopedic Society for Sports Medicine |
| ARRS | American Roentgen Ray Society |
| ASAAD | American Society for the Advancement of Anesthesia in Dentistry |