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Definition of atrioventricular. : of, relating to, or located between an atrium and ventricle of the heart.
The atrioventricular valves are located between the atria and the ventricles. They close during the start of ventricular contraction (systole), producing the first heart sound. There are two AV valves: Tricuspid valve â located between the right atrium and the right ventricle (right atrioventricular orifice).