semilunar

American

[sem-ee-loo-ner, sem-ahy-] / ˌsɛm iˈlu nər, ˌsɛm aɪ- /

adjective

shaped like a half-moon; crescent.

semilunar British

/ ˌsɛmɪˈluːnə /

adjective

shaped like a crescent or half-moon

"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

Other Word Forms

presemilunar adjective

Etymology

Origin of semilunar

First recorded in 1590–1600; semi- + lunar

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.

Both the aortic and the pulmonary valves are semilunar valves.

From Textbooks • Jun. 9, 2022

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

The atrioventricular valves form between weeks five and eight, and the semilunar valves form between weeks five and nine.

From Textbooks • Jun. 19, 2013

Blood is pumped from the heart, pushing open the pulmonary and aortic semilunar valves.

From Textbooks • Jun. 19, 2013

A, A, A, The semilunar ganglion and solar plexus, situated below the diaphragm and behind the stomach.

From A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition) by Cutter, Calvin

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