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PACEMAKER

Definition:

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

Synonyms:

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