| AAR | active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction |
|---|---|
| ARA | Academy of Rehabilitative Audiometry; acetylene reduction activity; American Rheumatism Association;... |
| ARAMIS | American Rheumatism Association Medical Information System |
| CAR | Canadian Association of Radiologists; cancer-associated retinopathy; cardiac ambulation routine; cel... |
| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |