Dictionary

pacemaker

noun pace·mak·er \ˈpās-ˌmā-kər\

medical : a small electrical machine put inside a person to make the heart beat evenly

Full Definition of PACEMAKER

1
a :  one that sets the pace for another
b :  one that takes the lead or sets an example
2
a :  a group of cells or a body part (as the sinus node of the heart) that serves to establish and maintain a rhythmic activity
b :  an electrical device for stimulating or steadying the heartbeat or reestablishing the rhythm of an arrested heart
pace·mak·ing \-kiŋ\ noun

Examples of PACEMAKER

  1. <has long been regarded as a pacemaker in home electronics>

First Known Use of PACEMAKER

1884

pacemaker

noun pace·mak·er \ˈpā-ˌsmā-kər\   (Medical Dictionary)

Medical Definition of PACEMAKER

1
:  a group of cells or a body part (as the sinoatrial node of the heart) that serves to establish and maintain a rhythmic activity
2
:  an electrical device for stimulating or steadying the heartbeat or reestablishing the rhythm of an arrested heart—called also pacer

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