| AAA | abdominal aortic aneurysm/aneurysmectomy; acne-associated arthritis; acquired aplastic anemia; acute anxiety attack; alacrimia-achalasia-addisonianism [syndrome]; American Academy of Addictionology; American Academy of Allergy; American Association of Anatomists; androgenic anabolic agent; aneurysm of ascending aorta; Area Agency on Aging; aromatic amino acid; arrest after arrival |
|---|---|
| AAAD | aromatic amino acid decarboxylase |
| AAAE | amino acid activating enzyme |
| AAAHE | American Association for the Advancement of Health Education |
| AAAI | American Academy of Allergy and Immunology |
| AAALAC | American Association for Accreditation of Laboratory Animal Care |
| AAAS | American Association for the Advancement of Science |