/ Dictionary / Index C -cardium: Meaning and Definition of Find definitions for: -cardium Pronunciation: [key] a combining form occurring in compounds that denote tissue or organs associated with the heart, as specified by the initial element: myocardium; pericardium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: -cardium (Thesaurus) carditis card-key Related Content Daily Word Quiz: boorish Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language