[dee-fahy-bruh-leyt, -fib-ruh-]
verb (used with object), defibrillated, defibrillating. Medicine/Medical.
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.

1930–35; de- + fibrillate, back formation from fibrillation

defibrillation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
defibrillation (dɪˌfaɪbrɪˈleɪʃən, -fɪb-)
med the application of an electric current to the heart to restore normal rhythmic contractions after the onset of atrial or ventricular fibrillation

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1940, in reference to heartbeat, from fibrillating "beating in an abnormal way," from Mod.L. fibrilla, dim. of fibra "fiber," in reference to the muscle strands of the heart that contract irregularly in this condition.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

defibrillation de·fib·ril·la·tion (dē-fĭb'rə-lā'shən, -fī'brə-)
The stopping of fibrillation of the heart muscle and the restoration of normal contractions using of drugs or electric shock.

de·fib'ril·late' v.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
defibrillation   (dē-fĭb'rə-lā'shən)  Pronunciation Key 
Termination of fibrillation of the heart muscle and restoration of normal heart rhythm, especially by one or more electric shocks administered by paddles applied to the chest.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for defibrillation
In addition, there is increasing use of public access defibrillation.
Defibrillation differs in that the shock is not synchronised.
Often, more electricity is required for defibrillation than for cardioversion.
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