semilunar

American  

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

adjective

1. shaped like a half-moon; crescent.

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semilunar British  

/ ˌsɛmɪˈluːnə /

adjective

1. shaped like a crescent or half-moon

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Other Word Forms

• presemilunar adjective

Etymology

Origin of semilunar

First recorded in 1590–1600; semi- + lunar

Example Sentences

Closing of the semilunar valves produces a monosyllabic “dup” sound.

From Textbooks • Jun. 9, 2022

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

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

As ventricular pressure drops, there is a tendency for blood to flow back into the atria from the major arteries, producing the dicrotic notch in the ECG and closing the two semilunar valves.

From Textbooks • Jun. 19, 2013

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

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall