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semilunar valve

noun

, Anatomy.
  1. 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

noun

  1. 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
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Word History and Origins

Origin of semilunar valve1

First recorded in 1710–20
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Example Sentences

The openings of the arteries behind the semilunar valves may be very small.

The thoracic duct is equal in diameter to a goose-quill, and, at its termination, is provided with a pair of semilunar valves, which prevent the admission of venous blood into its cylinder.

The semilunar valves of the pulmonary artery and aorta were unusually small, and their bases cartilaginous.

Just under the mucous membrane covering the anal columns and semilunar valves is the fatty tissue forming a bed upon which the mucous membrane rests.

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

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