sem'ilu'nar valve'

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, pulmonary valve.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

semilunar bonesemimajor axis
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