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sinoatrial node

American  
[sahy-noh-ey-tree-uhl, sahy-] / ˈsaɪ noʊˈeɪ tri əl, ˌsaɪ- /

noun

Anatomy.

  1. a small mass of tissue in the right atrium functioning as pacemaker of the heart by giving rise to the electric impulses that initiate heart contractions.

sinoatrial node Scientific  
/ sī′nō-ā′trē-əl /

  1. A small mass of specialized cardiac muscle fibers that acts as a pacemaker by initiating and maintaining normal heartbeat and cardiac rhythm. It is located in the right atrium.

Etymology

Origin of sinoatrial node

1920–25; sino- + atrial ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.