/ Thesaurus / R Synonyms of right atrium of the heart Find synonyms for: Noun1. right atrium, right atrium of the heart, atrium dextrum, atrium cordis, atrium of the heartusage: the right upper chamber of the heart that receives blood from the venae cavae and coronary sinusWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language