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Longman Dictionary of Contemporary English
defibrillator
noun
EXAMPLES FROM CORPUS
▪ A defibrillator can analyze the heart rhythm of a cardiac arrest victim and administer an electric shock.
▪ During the six minutes before medics arrived, co-workers revived his heart rhythm with the help of the defibrillator, Wiley said.
▪ Penders was diagnosed with cardiomyopathy in 1991 and decided to have a defibrillator installed Thursday as insurance against heart attacks.
▪ The defibrillator will be kept where employees can get to it within three minutes, Weer said.
▪ These ranged from a peak flow meter and a sphygmomanometer to oxygen and a defibrillator.
Douglas Harper's Etymology Dictionary
defibrillator

1956, agent noun from defibrillation.

Wiktionary
defibrillator

n. (context medicine English) 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.

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

Usage examples of "defibrillator".

Cardiovascular implants come in a wide variety: vascular grafts, defibrillators, cardioverters, artificial heart valves, even entire artificial hearts.

Almost too equipped, in fact: Among the medical supplies in the lockers, Hatch found a colonoscope, a defibrillator, a fancy electronic Geiger counter, and a variety of expensive-looking high-tech gadgets he couldn't identify.

For example, the powdered orange juice substitute Tang was a product of the manned space program, and spinoffs have occurred in cordless tools, implanted cardiac defibrillators, liquid-cooled garments, and digital imaging—to name a few.