aortic valve

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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.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

Such and such a time, such and such a day, then trouble with the valve.
Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
The flawed valve was rapidly replaced by a more robust system.
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This safety valve allows citizens to sound the alarm and challenge those whose views are hateful and totalitarian.
The Opponents of Militant Islamism Are Often As Bigoted as Their Targets|Jacob Mchangama|December 7, 2013|DAILY BEAST
[W] thout an exchange-rate safety valve you need an alternate way to rebalance economies.
Countdown to Euro Crack-Up|David Frum|May 31, 2012|DAILY BEAST

He also might have a heart-valve problem, but recovery from repair of these generally takes longer than a few days.
John Edwards Doctor's Notes Push Back Trial: Is He Really Sick?|Kent Sepkowitz|January 14, 2012|DAILY BEAST
A feed-pump forced water into the boilers; each had a safety-valve with a lever and weight.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
The valve-seat H has formed on its lower surface two crescent shaped long and narrow slits.
The Recent Revolution in Organ Building|George Laing Miller
The discharge-valve was then opened for a moment, allowing a blast of steam to escape, reducing the pressure say to one-half.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
The valve open while the plunger-pole ascended 20 inches, then went the remainder of the 10-feet stroke expansive.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick
The engine boy having fixed the safety-valve while he fished for eels, caused an explosion of the boiler.
Life of Richard Trevithick, Volume II (of 2)|Francis Trevithick

aortic valve

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

aortic valve

[ ā-ôr′tĭk ]

A valve located in the aorta that prevents the backflow of blood to the left ventricle.