• IPA: /ˈpeɪsˌmeɪkəɹ/

pacemaker (plural pacemakers)

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