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