pacemaker
1. a leading instance in its field - the new policy will be a pacesetter in community relations • Syn: pacesetter • Hypernyms: exemplar, example, model, good example 2. an implanted electronic device that takes over the function of the natural cardiac pacemaker • Syn: artificial pacemaker • Hypernyms: electronic device 3. a specialized bit of heart tissue that controls the heartbeat • Syn: cardiac pacemaker, sinoatrial node, SA node • Hypernyms: cardiac muscle, heart muscle 4. a horse used to set the pace in racing • Syn: pacer, pacesetter • Derivationally related forms: pace (for: pacer) • Hypernyms: racehorse, race horse, bangtail
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