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AOC
AONB
AOPEC
AOR
aorist
aorta
aortic arch
aortic arch syndrome
aortic valve
aortography
AOSIS
Aotearoa
aoudad
AP
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ap- (2)
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aortic valve
a·or·tic valve (plural a·or·tic valves)


noun 
Definition:
 
valve by which blood leaves heart: the valve in the largest artery aorta in the body at the point where it leaves the heart. It allows the blood to flow out but not back into the heart.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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