Pacemaker

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  pacemaker \pacemaker\ n. (Physiol. & Anat.)
     1. a specialized bit of heart tissue that controls the
        heartbeat.
  
     Syn: cardiac pacemaker, sinoatrial node.
          [WordNet 1.5]


  
     2. An implanted electronic device that takes over the
        function of the natural cardiac pacemaker[1]; -- used to
        assist people whose heartbeat is irregular.
  
     Syn: artificial pacemaker.
          [WordNet 1.5]
  
     3. A horse used to set the pace in racing.
  
     Syn: pacer, pacesetter.
          [WordNet 1.5]

From WordNet (r) 2.0 [wn]:

  pacemaker
       n 1: a leading instance in its field; "the new policy will be a
            pacesetter in community relations" [syn: {pacesetter}]
       2: a specialized bit of heart tissue that controls the
          heartbeat [syn: {cardiac pacemaker}, {sinoatrial node}, {SA
          node}]
       3: an implanted electronic device that takes over the function
          of the natural cardiac pacemaker [syn: {artificial
          pacemaker}]
       4: a horse used to set the pace in racing [syn: {pacer}, {pacesetter}]