1. [ noun ] an implanted electronic device that takes over the function of the natural cardiac pacemaker
Synonyms: artificial_pacemaker
Related terms: electronic_device
2. [ noun ] (anatomy,zoology) a specialized bit of heart tissue that controls the heartbeat
Synonyms: sinoatrial_node SA_node cardiac_pacemaker
Related terms: cardiac_muscle
3. [ noun ] a leading instance in its field
Synonyms: pacesetter

"the new policy will be a pacesetter in community relations"

Related terms: exemplar
4. [ noun ] (zoology,horse racing) a horse used to set the pace in racing
Synonyms: pacesetter pacer
Related terms: racehorse pace
Similar spelling:   peacemaker