Each of a pair of valves in the heart, at the bases of the aorta and the pulmonary artery, consisting of three cusps or flaps that prevent the flow of blood back into the heart.
- The ventricular septum and the atrioventricular and semilunar valves were unremarkable.
- To assess valvular incompetence colour-Doppler technique was carried out, as it reveals a systolic regurgitant jet across atrio-ventricular valves and a diastolic one across semilunar valves.
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Syllabification: sem·i·lu·nar valve
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