DEFIBRILLATOR
defibrillator
(noun) an electronic device that administers an electric shock of preset voltage to the heart through the chest wall in an attempt to restore the normal rhythm of the heart during ventricular fibrillation
Source: WordNet® 3.1
Etymology
Noun
defibrillator (plural defibrillators)
(medicine) An electronic device used internally or externally that delivers a controlled electric shock to a patient to correct ventricular fibrillation, a lack of coordination of the contraction of muscle tissue of the large chambers of the heart.
Source: Wiktionary