semilunar valve
noun Date: circa 1719 any of the crescent-shaped cusps that occur as a set of three between the heart and the aorta and another of three between the heart and the pulmonary artery, are forced apart by pressure in the ventricles during systole and pushed together by pressure in the arteries during diastole, and prevent regurgitation of blood into the ventricles; also either set of three cusps

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • semilunar valve — n 1) either of two valves of which one is situated at the opening between the heart and the aorta and the other at the opening between the heart and the pulmonary artery, which prevent regurgitation of blood into the ventricles, and each of which …   Medical dictionary

  • semilunar valve — n. either of two crescent shaped heart valves, one, a pulmonary valve, at the junction of the right ventricle and pulmonary artery, the other, an aortic valve, at the junction of the left ventricle and aorta, which keep blood from flowing back… …   English World dictionary

  • semilunar valve — noun a heart valve with cusps shaped like half moons; prevents blood from flowing back into the heart • Hypernyms: ↑heart valve, ↑cardiac valve • Hyponyms: ↑aortic valve, ↑pulmonary valve …   Useful english dictionary

  • semilunar valve — Anat. 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. Cf. aortic valve,… …   Universalium

  • semilunar valve — either of the two valves in the heart situated at the origin of the aorta (see aortic valve) and the pulmonary artery (see pulmonary valve). Each consists of three flaps (cusps), which maintain the flow of blood in one direction …   The new mediacal dictionary

  • semilunar valve — /sɛmiˈlunə vælv/ (say semee loohnuh valv) noun 1. a crescent shaped valve consisting of three flaps, in the orifice of the aorta, which prevents blood from flowing back into the left ventricle. 2. a similar valve in the pulmonary artery, which… …   Australian English dictionary

  • semilunar valve — sem′ilu′nar valve′ n. anat. either of two heart valves situated at the ventricular openings to the aorta and the pulmonary artery, each containing three crescent shaped flaps that prevent the reverse flow of blood …   From formal English to slang

  • semilunar valve — noun Anatomy each of a pair of valves in the heart at the bases of the aorta and the pulmonary artery …   English new terms dictionary

  • Клапан Полулунный (Semilunar Valve) — один из двух клапанов сердца, расположенных в месте выхода аорты (аортальный клапан (aortic valve)) и легочной артерии (клапан легочного ствола (pulmonary valve)). Каждый клапан имеет три створки, которые обеспечивают ток крови только в одном… …   Медицинские термины

  • Semilunar — can refer to: * Semilunar valves * An older name for the Lunate bone …   Wikipedia

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