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defibrillator (n.)

by 1953, an agent-noun form probably based on defibrillation.

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Definitions of defibrillator from WordNet

defibrillator (n.)
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;
From wordnet.princeton.edu