/ Dictionary / Index C cardiac cycle: Meaning and Definition of Find definitions for: car'diac cy"cle Pronunciation: [key] one complete heartbeat, consisting of one contraction and relaxation of the heart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cardiac arrest cardiac glycoside Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language