pacemaker

noun

1. a leading instance in its field; “the new policy will be a pacesetter in community relations”

   Synonyms

   • pacesetter

   Less specific

   • exemplar, example, model, good example

2. a specialized bit of heart tissue that controls the heartbeat

   Synonyms

   • cardiac pacemaker, sinoatrial node, SA node

   Less specific

   • cardiac muscle, heart muscle

3. an implanted electronic device that takes over the function of the natural cardiac pacemaker

   Synonyms

   • artificial pacemaker

   Less specific

   • electronic device

4. a horse used to set the pace in racing

   Synonyms

   • pacer, pacesetter

   Less specific

   • racehorse, race horse, bangtail