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