Definition of "pacemaker" in English

noun

1. (anatomy) Specialized cells which stimulate the heart to beat.

   • natural pacemaker
   • cardiac pacemaker

2. (by extension, medicine) A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.

   • artificial pacemaker

3. (now uncommon) One who sets the pace in a race, to guide the others.