/ Thesaurus / C Synonyms of cardiac arrhythmia Find synonyms for: Noun1. cardiac arrhythmia, arrhythmia, heart disease, cardiopathyusage: an abnormal rate of muscle contractions in the heartWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language