atrioventricular node


: a small mass of tissue in the right atrioventricular region of higher vertebrates through which impulses from the sinus node are passed to the ventricles

Word History

First Known Use

1908, in the meaning defined above

Time Traveler
The first known use of atrioventricular node was in 1908

Dictionary Entries Near atrioventricular node

Cite this Entry

“Atrioventricular node.” Dictionary, Merriam-Webster, Accessed 30 Nov. 2023.

Medical Definition

atrioventricular node

: a small mass of tissue that is situated in the wall of the right atrium adjacent to the septum between the atria, passes impulses received from the sinoatrial node to the ventricles by way of the bundle of His, and in some pathological states replaces the sinoatrial node as pacemaker of the heart

More from Merriam-Webster on atrioventricular node

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!