pacemaker

Pronunciation: /ˈpeɪsˌmeɪkəɹ/

The English word “pacemaker” has 3 meanings listed here.

noun

Specialized cells which stimulate the heart to beat.
A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.
One who sets the pace in a race, to guide the others.

From pace + maker.

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