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

After blood passes through the pulmonary arteries, the right semilunar valves close preventing the blood from flowing backwards into the right ventricle.

From Textbooks • Jun. 9, 2022

The second heart sound, S2 or dub, occurs when the semilunar valves close.

From Textbooks • Jun. 19, 2013

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

From Textbooks • Jun. 19, 2013

The valves at the openings that lead to the pulmonary trunk and aorta are known generically as semilunar valves.

From Textbooks • Jun. 19, 2013

Sedillot makes a semilunar or ovoid flap, the base of which is just below the great trochanter, and which includes it, the convexity being upwards and the flap being turned down.

From A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners by Bell, Joseph