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Noun pacemaker has 4 senses
  1. pacesetter, pacemaker - a leading instance in its field; "the new policy will be a pacesetter in community relations"
    --1 is a kind of exemplar, example, model, good example
  2. pacemaker, cardiac pacemaker, sinoatrial node, SA node - a specialized bit of heart tissue that controls the heartbeat
    --2 is a kind of cardiac muscle, heart muscle
  3. pacemaker, artificial pacemaker - an implanted electronic device that takes over the function of the natural cardiac pacemaker
    --3 is a kind of electronic device
  4. pacer, pacemaker, pacesetter - a horse used to set the pace in racing
    --4 is a kind of racehorse, race horse, bangtail
paca pacaderms pace-setting pace pace car pace lap pace maker paced pacemaker pacemakers pacemsit pacer paces paceset pacesetter pacesetting pach

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