Dictionary.com
definitions

coronary sinus

noun Anatomy.

a large venous channel in the heart wall that receives blood via the coronary veins and empties into the right atrium.

Origin of coronary sinus

First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
coronary sinus in Medicine

coronary sinus

n.

A short trunk receiving most of the veins of the heart, running in the posterior part of the coronary sulcus and emptying into the right atrium between the inferior vena cava and the atrioventricular orifice.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.