| A-V | Arterio-Venous |
|---|---|
| A-V | Atrio-Ventricular |
| A-V | arterial venous |
| A-V | auditory-visual |
| A-VO2 | Arteriovenous oxygen difference |
| A-W GC | apatite- and wollastonite-containing glass ceramic |
| A. a. | A. actinomycetemcomitans |
| A.A. | Alcoholic Anonymous |
| A.A. | Alopecia areata |
| A.C.A. | anterior cerebral arteries |