Definitions from Wiktionary (pacemaker)

▸ noun:  (anatomy) A set of nerves which stimulate the heart to beat.
▸ noun:  (by extension, medicine) A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.
▸ noun:  (now uncommon) One who sets the pace in a race, to guide the others.
▸ Also see pacemaker

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