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pacemaker

[peys-mey-ker] /ˈpeɪsˌmeɪ kər/
noun
2.
Medicine/Medical. an electronic device implanted beneath the skin for providing a normal heartbeat by electrical stimulation of the heart muscle, used in certain heart conditions.
3.
Anatomy, Physiology. any specialized tissue that governs a rhythmic or cyclic biological activity, as the sinoatrial node of the heart that controls heartbeat.
Origin
1880-1885
1880-85; pace1 + maker
Related forms
pacemaking, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for pacemaker
  • Pneumonia in his right lung can be seen as clearly as the pacemaker implanted to regulate the rhythm of his heart.
  • Her heart hasn't been good for a long time, but the doc says she can treat the current problem with meds or a pacemaker.
  • In cases of distress, a pacemaker sends an electrical impulse to select points in the heart to speed up or coordinate the firing.
  • The gene probably controls the synthesis of a key protein in pacemaker neurons, which regulate the body's clock.
  • It took some explaining, but it finally transpired that she was wearing a special pacemaker designed to control her incontinence.
  • The whole drug-delivery system finishes up as an implantable device no bigger than a cardiac pacemaker.
  • Larger sheets could generate enough power to charge a pacemaker, but the material has not been tested in animals yet.
  • Soon, excess pounds will be shed using a stomach pacemaker.
  • Banish dark mood spells by implanting a neural pacemaker.
  • The heart has a natural pacemaker: a set of cells whose electrical impulses trigger the heart's chambers to contract rhythmically.
British Dictionary definitions for pacemaker

pacemaker

/ˈpeɪsˌmeɪkə/
noun
1.
a person, horse, vehicle, etc, used in a race or speed trial to set the pace
2.
a person, an organization, etc, regarded as being the leader in a particular field of activity
3.
Also called cardiac pacemaker. a small area of specialized tissue within the wall of the right atrium of the heart whose spontaneous electrical activity initiates and controls the beat of the heart
4.
Also called artificial pacemaker. an electronic device for use in certain cases of heart disease to assume the functions of the natural cardiac pacemaker
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pacemaker
n.

also pace-maker, 1884, originally a rider or boat that sets the pace for others in training. Meaning "the node of the heart whivh determines the beat rate" is from 1910; sense of "man-made device for stimulating and regulating heartbeat" is from 1951. From pace (n.) + maker.

Online Etymology Dictionary, © 2010 Douglas Harper
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pacemaker in Medicine

pacemaker pace·mak·er (pās'mā'kər)
n.

  1. A part of the body, such as the specialized mass of cardiac muscle fibers of the sinoatrial node, that sets the pace or rhythm of physiological activity.

  2. Any of several usually miniaturized and surgically implanted electronic devices used to stimulate or regulate contractions of the heart muscle.

  3. A substance whose rate or reaction sets the pace for a series of chain reactions.

  4. The rate-limiting reaction itself.


pace'mak'ing adj. & n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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pacemaker in Science
pacemaker
  (pās'mā'kər)   
  1. Any of several usually miniaturized and surgically implanted electronic devices used to stimulate or regulate contractions of the heart muscle. Electrodes attached to the heart muscle conduct electrical signals generated from the pacemaker, which either provides constant electrical stimuli to regularize the heartbeat (fixed-rate pacemakers) or provides a stimulus only when electrical activity within the heart is abnormal (demand pacemakers). Pacemakers are used in the treatment of various arrhythmias.

  2. A part of the body, such as the specialized mass of cardiac muscle fibers of the sinoatrial node, that sets the pace or rhythm of physiological activity.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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pacemaker in Culture

pacemaker definition


A group of specialized muscle fibers in the heart that send out impulses to regulate the heartbeat. If the heart's built-in pacemaker does not function properly, an artificial pacemaker may be necessary — a small electrical device that also regulates the heartbeat by sending out impulses. An artificial pacemaker may be placed inside the body surgically or may be worn outside.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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