pacemaker
Americannoun
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pacemakers
plural
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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.
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Anatomy, Physiology. any specialized tissue that governs a rhythmic or cyclic biological activity, as the sinoatrial node of the heart that controls heartbeat.
noun
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a person, horse, vehicle, etc, used in a race or speed trial to set the pace
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a person, an organization, etc, regarded as being the leader in a particular field of activity
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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
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Also called: artificial pacemaker. an electronic device for use in certain cases of heart disease to assume the functions of the natural cardiac pacemaker
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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.
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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.
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Nouns
Etymology
Origin of pacemaker
Explanation
A pacemaker is a medical device that controls a person's heartbeat. A patient only has a pacemaker implanted when his own heart isn't working well on its own. The human heart has a natural pacemaker that makes it beat at an appropriate rate to keep blood flowing throughout the body. Sometimes it doesn't work right, because of some kind of blockage or other problem that causes the heart to beat too slowly. In these cases, cardiologists — or heart doctors — will often surgically implant an electronic pacemaker as a replacement. Pacemaker research began in 1899, but it wasn't until 1958 that the first patients received these lifesaving devices.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
The other main type is connected directly to the heart and, like a pacemaker, also sends regular electrical signals if the heart is beating too slowly.
From BBC ● Jun. 8, 2026
On Sunday, Boesen said "the pacemaker responded as it should".
From BBC ● Jun. 8, 2026
Eleven U.S. innovations, such as cornflakes, the implantable pacemaker and the microwave, were born from accidental discoveries.
From The Wall Street Journal ● Apr. 4, 2026
Investigators consider the octogenarian a “vulnerable adult” owing to her difficulty walking, pacemaker and a heart condition that required daily medication.
From The Wall Street Journal ● Feb. 24, 2026
In medicine, a new generation of pacemaker could regulate a person’s heartbeat for decades, rather than needing to be replaced every two years.
From "Reaching for the Moon" by Katherine Johnson
On its website, Compliant Technologies says it has tested the G.L.O.V.E on people with cardiovascular problems and pacemakers with no issues.
From Los Angeles Times ● Aug. 13, 2026
The building's superintendent, Juana Garcia, says nine residents have pacemakers and simply can't take the chance of being caught without the lift.
From BBC ● May 22, 2026
Because of Kipchoge’s use of wind-breaking pacemakers and other measures, the mark wasn’t eligible for a world record.
From The Wall Street Journal ● Apr. 26, 2026
It’s hundreds, thousands, and sometimes more than 100,000 people suing over life-changing physical harm from asbestos-laced baby powder, from NFL concussions, from pacemakers, hip implants, and other medical products.
From Slate ● Jan. 13, 2026
There are instances in which it would be to the mutual interest of employer and employee to increase the speed of work, but conditions may limit or forbid the use of pacemakers.
From Increasing Human Efficiency in Business, a contribution to the psychology of business by Walter Dill Scott
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
