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pacemaker (n.)

also pace-maker, 1884, "one who sets the pace for others," originally a rider or boat that sets the pace for others in training. Meaning "the node of the heart which determines the beat rate" is from 1910; sense of "man-made device for stimulating and regulating heartbeat" (short for artificial pacemaker) is from 1951. From pace (n.) + maker.

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