pacemaker

n. (Physiol. & Anat.) 1. a specialized bit of heart tissue that controls the heartbeat.
Syn. -- cardiac pacemaker, sinoatrial node.
[WordNet 1.5]

2. An implanted electronic device that takes over the function of the natural cardiac pacemaker{1}; -- used to assist people whose heartbeat is irregular.
Syn. -- artificial pacemaker.
[WordNet 1.5]

3. A horse used to set the pace in racing.
Syn. -- pacer, pacesetter.
[WordNet 1.5]

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Wed 15th October 2008