semilunar valve

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noun Anatomy.

either of two valves, one in the aorta and one in the pulmonary artery, consisting of a set of three crescent-shaped flaps of tissue and serving to prevent blood from flowing back into the heart after contraction.

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Compare aortic valve, pulmonary valve.

Origin of semilunar valve

First recorded in 1710–20

Words nearby semilunar valve

semiliterate, Sémillon, semilogarithmic, semilunar, semilunar bone, semilunar valve, semimajor axis, semimatte, semimicroanalysis, semiminor axis, semimonthly

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use semilunar valve in a sentence

Such and such a time, such and such a day, then trouble with the valve.
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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.
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[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.
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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

British Dictionary definitions for semilunar valve

semilunar valve

noun

anatomy either of two crescent-shaped valves, one in the aorta and one in the pulmonary artery, that prevent regurgitation of blood into the heart

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012