/ Thesaurus / L Synonyms of left atrium of the heart Find synonyms for: Noun1. left atrium, left atrium of the heart, atrium sinistrum, atrium cordis, atrium of the heartusage: the left upper chamber of the heart that receives blood from the pulmonary veinsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: imprudent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language