Longman Dictionary of Contemporary English homepage

pacemaker

 noun
     
Related topics: Hospital, Illness and Disability
pace‧mak‧er [countable]
1MH a small machine that is placed inside someone's chest in order to help their heart beat regularly
2 also pacesetter a person or horse who goes to the front in a race and sets the speed that the others must try to achieve
Definition from the Longman Dictionary of Contemporary English
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