| AMSAODD | American Medical Society on Alcoholism and Other Drug Dependencies |
|---|---|
| ANS | acanthion; American Nutrition Society; 8-anilino-1-naphthalene-sulfonic acid; anterior nasal spine; ... |
| AOA | American Osteopathic Association; Administration on Aging; Alpha Omega Alpha Honor Society; American... |
| AOSSM | American Orthopedic Society for Sports Medicine |
| ARRS | American Roentgen Ray Society |