Definition
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noun : PACEMAKER
Source:WordNet 3.1
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1. (
) a leading instance in its field; "the new policy will be a pacesetter in community relations" ;
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2. (
) a specialized bit of heart tissue that controls the heartbeat ;
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3. (
) an implanted electronic device that takes over the function of the natural cardiac pacemaker ;
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4. (
) a horse used to set the pace in racing ;
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