pacemaker

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pace|maker /p'eɪsmeɪkər/ (pacemakers)
1 [N-COUNT]
A pacemaker is a device that is placed inside someone's body in order to help their heart beat in the right way.
She was fitted with a pacemaker after suffering serious heart trouble.
2 [N-COUNT]
A pacemaker is a competitor in a race whose task is to start the race very quickly in order to help the other runners achieve a very fast time. Pacemakers usually stop before the race is finished.

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