Dictionaryde•fi•bril•la•torPronunciation: (dē-fī'bru-lā"tur, -fib'ru-), [key] —n. Med. an agent or device for arresting fibrillation of the atrial or ventricular muscles of the heart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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