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 artery). Each consists of three flaps (cusps), which maintain the flow of blood in one direction. Related category • ANATOMY AND PHYSIOLOGY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |