/ Dictionary / Index C coronary sinus: Meaning and Definition of Find definitions for: cor'onary si'nus Pronunciation: [key] — Anat. Anat. a large venous channel in the heart wall that receives blood via the coronary veins and empties into the right atrium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. coronary occlusion coronary thrombosis Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language