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sinus of Val·sal·va | \ -väl-ˈsäl-və 
\
\Medical Definition of sinus of Valsalva
: any one of the pouches of the aorta and pulmonary artery which are located behind the flaps of the semilunar valves and into which the blood in its regurgitation toward the heart enters and thereby closes the valves
— called also aortic sinus
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