defibrillatornoun [ C ]
uk/ˌdiːˈfɪb.rɪ.leɪ.tər/us/ˌdiːˈfɪb.rə.leɪ.t̬ɚ/specializeda machine that uses an electric current to stop any irregular and dangerous activity of the heart's muscles, used especially in hospitals:
Defibrillators are used to restore normal rhythm to the heart.
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