semilunar valve

American

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.

semilunar valve British

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

Etymology

Origin of semilunar valve

First recorded in 1710–20

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

semilunar valve

The pulmonary valve is located at the base of the pulmonary trunk, and the left semilunar valve is located at the base of the aorta.

From Textbooks ● Jun. 19, 2013

At the base of the aorta is the aortic semilunar valve that prevents backflow of blood into the left ventricle while the heart is relaxing.

From Textbooks ● Jun. 19, 2013

At the base of the pulmonary trunk is the pulmonary semilunar valve, which prevents backflow of blood into the right ventricle during ventricular diastole.

From Textbooks ● Jun. 19, 2013

There are three dilations in the wall of the aorta just superior to the aortic semilunar valve.

From Textbooks ● Jun. 19, 2013

The right semilunar valve is situated around the opening of the right ventricle into the pulmonary artery.

From Physiology and Hygiene for Secondary Schools by Walters, Francis M.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023