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Noun pacemaker has 4 senses
- pacesetter, pacemaker - a leading instance in its field; "the new policy will be a pacesetter in community relations"
--1 is a kind of exemplar, example, model, good example
- pacemaker, cardiac pacemaker, sinoatrial node, SA node - a specialized bit of heart tissue that controls the heartbeat
--2 is a kind of cardiac muscle, heart muscle
- pacemaker, artificial pacemaker - an implanted electronic device that takes over the function of the natural cardiac pacemaker
--3 is a kind of electronic device
- pacer, pacemaker, pacesetter - a horse used to set the pace in racing
--4 is a kind of racehorse, race horse, bangtail