| AAR | active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction |
|---|---|
| AASP | acute atrophic spinal paralysis; American Association of Senior Physicians; ascending aorta synchron... |
| AAU | acute anterior uveitis |
| ABE | acute bacterial endocarditis; American Board of Endodontics; botulism equine trivalent antitoxin |
| ABPE | acute bovine pulmonary edema |