aortic valve

noun Anatomy.
a semilunar valve between the aorta and the left ventricle of the heart that prevents the blood from flowing back into the left ventricle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

aortic valve n.
The valve between the left ventricle of the heart and the ascending aorta, consisting of three semilunar cusps.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
aortic valve   (ā-ôr'tĭk)  Pronunciation Key 
A valve located in the aorta that prevents the backflow of blood to the left ventricle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When the ultrasonic scope is inserted, you can see everything in motion, even
  the aortic valve opening and closing.
At its origin it presents, opposite the segments of the aortic valve, three
  small dilatations called the aortic sinuses.
The aortic valve also spewed blood in the wrong direction.
Surgery to repair or replace the aortic valve corrects aortic insufficiency.
Images for aortic valve
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