1 a person, horse, vehicle, etc., used in a race or speed trial to set the pace
2 a person, an organization, etc., regarded as being the leader in a particular field of activity
3 (Also called)
cardiac pacemaker a small area of specialized tissue within the wall of the right atrium of the heart whose spontaneous electrical activity initiates and controls the beat of the heart
4 (Also called)
artificial pacemaker an electronic device for use in certain cases of heart disease to assume the functions of the natural cardiac pacemaker
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