| ALAO | angiographic area of left anterior oblique projection |
|---|---|
| Ao | orifice area |
| AOC | abridged ocular chart; amyloxycarbonyl; anodal opening contraction; area of concern |
| ARAO | angiographic area of right anterior oblique projection |
| ARF | acute renal failure; acute respiratory failure; acute rheumatic fever; Addiction Research Foundation... |