Semilunar valves
Semilunar Sem`i*lu"nar, a. Shaped like a half moon. [1913 Webster]

{Semilunar bone} (Anat.), a bone of the carpus; the lunar. See {Lunar}, n.

{Semilunar valves}, or {Sigmoid valves} (Anat.), the valves at the beginning of the aorta and of the pulmonary artery which prevent the blood from flowing back into the ventricle. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Semilunar — Sem i*lu nar, a. Shaped like a half moon. [1913 Webster] {Semilunar bone} (Anat.), a bone of the carpus; the lunar. See {Lunar}, n. {Semilunar valves}, or {Sigmoid valves} (Anat.), the valves at the beginning of the aorta and of the pulmonary… …   The Collaborative International Dictionary of English

  • Semilunar bone — Semilunar Sem i*lu nar, a. Shaped like a half moon. [1913 Webster] {Semilunar bone} (Anat.), a bone of the carpus; the lunar. See {Lunar}, n. {Semilunar valves}, or {Sigmoid valves} (Anat.), the valves at the beginning of the aorta and of the… …   The Collaborative International Dictionary of English

  • semilunar cusp — n any of the crescentic cusps making up the semilunar valves * * * any of the cusps surrounding the aortic and pulmonary valves; see entries beginning vavlula semilunaris …   Medical dictionary

  • 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 — 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 — 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

  • 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 — 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

  • Sigmoid valves — Semilunar Sem i*lu nar, a. Shaped like a half moon. [1913 Webster] {Semilunar bone} (Anat.), a bone of the carpus; the lunar. See {Lunar}, n. {Semilunar valves}, or {Sigmoid valves} (Anat.), the valves at the beginning of the aorta and of the… …   The Collaborative International Dictionary of English

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