pacemaker

/หˆpeษชsหŒmeษชkษ™ษน/

IPA: /P EY1 S M EY0 K ER0/

noun
  1. 1

    One who sets the pace in a race, to guide the others.

  2. 2

    A set of nerves which stimulate the heart to beat.

  3. 3

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

Source: https://en.wiktionary.org/wiki/pacemaker