Each of the structures occupying the openings of the ventricles of the heart, consisting of two or three membranous cusps, and acting to prevent backflow of blood during and after ventricular contraction.
Origin
Mid 19th century.
Definition of heart valve in US English:
heart valve
noun
Each of the structures occupying the openings of the ventricles of the heart, consisting of two or three membranous cusps, and acting to prevent backflow of blood during and after ventricular contraction.