noun. An electrical device used to counteract fibrillation of the heart muscle and restore normal heartbeat by applying a brief electric shock.

noun. 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.

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

"If an automated external defibrillator is available, people assisting a cardiac-arrest patient should attach the device to the victim and follow its instructions."

electronic device  

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