/ Dictionary / Index D defibrillate: Meaning and Definition of Find definitions for: de•fi•bril•late Pronunciation: (dē-fī'bru-lāt", -fib'ru-), [key] — -lat•ed, -lat•ing. to arrest the fibrillation of (heart muscle) by applying electric shock across the chest, thus depolarizing the heart cells and allowing normal rhythm to return. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: defibrillate (Thesaurus) defibrate defibrillator Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language