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pacemaker, pacesetter | a leading instance in its field | |
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pacemaker, cardiac pacemaker, sinoatrial node, SA node | a specialized bit of heart tissue that controls the heartbeat | |
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pacer, pacemaker, pacesetter | a horse used to set the pace in racing | |
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pacemaker, artificial pacemaker | an implanted electronic device that takes over the function of the natural cardiac pacemaker |