/ Dictionary / Index C cardioaccelerator: Meaning and Definition of Find definitions for: car•di•o•ac•cel•er•a•tor Pronunciation: (kär"dē-ō-ak-sel'u-rā"tur), [key] — n. Pharm. a substance that increases the heart rate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cardio- cardioactive Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language