01 n. a specialized bit of heart tissue that controls the heartbeat.
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1.
a specialized bit of heart tissue that controls the heartbeat.(Physiol. & Anat.)
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2.
An implanted electronic device that takes over the function of the natural cardiac pacemaker{1}; -- used to assist people whose heartbeat is irregular.
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3.
A horse used to set the pace in racing.
Syn.
cardiac pacemaker, sinoatrial node. — Syn. -- artificial pacemaker. — Syn. -- pacer, pacesetter.