defibrillate

[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.

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

defibrillation, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
defibrillate

verb
stop the fibrillation and restore normal contractions, usually by means of electric shocks; "The patient's heart had to be defibrillated to save his life" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
The tiny little snippets are enough to defibrillate a weak heart.
After seven attempts to defibrillate, or electrically shock the heart into
  beating normally, a rhythm was restored.
When an attempt was made to defibrillate, however, the defibrillator did not
  respond.
All in-service transporting ambulances must have the ability to defibrillate
  patients of all age groups.
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