Breadcrumb Home > Thesaurus Cite Synonyms of cardioid Find synonyms for: Noun1. cardioid, epicycloidusage: an epicycloid in which the rolling circle equals the fixed circleWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.See also: cardioid (Dictionary) Related Content Daily Word Quiz: parallax Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language Synonyms Index