| aMVL | anterior mitral valve leaflet |
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| AO | abdominal aorta; achievement orientation; acid output; acridine orange; ankle orthosis; anodal openi... |
| AOV, AoV | aortic valve |
| ASAH | antibiotic sterilized aortic valve homograft |
| ASV | anodic stripping voltammetry; antisiphon valve; antisnake venom; avian sarcoma virus |
| lunula of semilunar valve | The free border of a semilunar valve at each side of the nodulus valvulae semilunaris. Synonym: lunula valvulae semilunaris. (05 Mar 2000) |
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