noun Download 🔗Share 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. Examples : "The paramedics used a defibrillator to shock the man's heart back into a normal rhythm after he collapsed. " medicine device electronics physiology technology organ body anatomy electric Chat with AIVocabulary GamePractice Reading