/ Dictionary / Index C cardiotonic: Meaning and Definition of Find definitions for: car•di•o•ton•ic Pronunciation: (kär"dē-ō-ton'ik), [key] — Med. Med. —adj. having a tonic effect on the action of the heart. —n. a cardiotonic substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cardiotachometer cardiovascular Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language