pacemaker

1. (noun) an implanted electronic device that takes over the function of the natural cardiac pacemaker
Synonyms: artificial pacemaker
Related Words: electronic device

2. (noun) a specialized bit of heart tissue that controls the heartbeat
Synonyms: SA node, cardiac pacemaker, sinoatrial node
Related Words: cardiac muscle, heart muscle

3. (noun) a horse used to set the pace in racing
Synonyms: pacer, pacesetter
Related Words: bangtail, race horse, racehorse



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