pacemaker

  1. Noun.  One who sets the pace in a race, to guide the others.
  2. Noun.  (anatomy) A set of nerves which stimulate the heart to beat.
  3. Noun.  (context, hence) A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.

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This entry was last updated on RefTopia from its source on 3/20/2012.