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Meaning of pacemaker

pace•mak•er

Pronunciation: (pās'mā"kur), [key]
— n.
  1. pacesetter.
  2. an electronic device implanted beneath the skin for providing a normal heartbeat by electrical stimulation of the heart muscle, used in certain heart conditions.
  3. any specialized tissue that governs a rhythmic or cyclic biological activity, as the sinoatrial node of the heart that controls heartbeat.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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