fibrillation

noun
fi·​bril·​la·​tion | \ ˌfi-brə-ˈlā-shən How to pronounce fibrillation (audio) , ˌfī-\

Definition of fibrillation

1 : an act or process of forming fibers or fibrils
2a : a muscular twitching involving individual muscle fibers acting without coordination
b : very rapid irregular contractions of the muscle fibers of the heart resulting in a lack of synchronism between heartbeat and pulse

Examples of fibrillation in a Sentence

Recent Examples on the Web

The procedure takes about 30 seconds, the Apple Watch can also monitor a wearer's heartbeat for atrial fibrillation or a dangerously low pulse in the background. Eric Limer, Popular Mechanics, "iPhone XS, iPhone XR, Apple Watch and More: Apple's 2018 iPhone Event Roundup," 12 Sep. 2018 If you have been previously diagnosed with atrial fibrillation, Apple’s setup process tells you not to use the feature. Dieter Bohn, The Verge, "Apple Watch electrocardiogram and irregular heart rate features are available today," 6 Dec. 2018 Genetics have left me susceptible to atrial fibrillation, a heart arrhythmia with severe health implications. John Timmer, Ars Technica, "A look at the Apple Watch’s ECG, from someone who needs it," 12 Dec. 2018 What's more, the new Apple Watch's ECG feature is FDA-cleared to detect atrial fibrillation (an irregular heart rate that increases your risk for stroke and heart failure) and to give users notifications that their heartbeat is irregular. Korin Miller, SELF, "Here’s What Cardiologists Say About the Apple Watch’s New Heart Monitoring Features," 14 Sep. 2018 He was eventually diagnosed with atrial fibrillation, which results in irregular heart rate. Lori Riley, courant.com, "The Flu, Pulled Hamstrings And An Irregular Heart Rate Can't End The Streaks Of These Local Runners," 4 May 2018 On the new Series 4 Watches, watchOS 5 also includes fall detection support and will soon include Apple's ECG app for detecting health issues associated with irregular heart rates, such as atrial fibrillation. Valentina Palladino, Ars Technica, "Apple’s watchOS 5.0.1 addresses bug that may prevent Watches from charging," 28 Sep. 2018 The features are also not intended to be used by people under age 22 or by people who have had previous atrial fibrillations or other arrhythmias. Korin Miller, SELF, "Here’s What Cardiologists Say About the Apple Watch’s New Heart Monitoring Features," 14 Sep. 2018 The new electrocardiogram, or ECG, app carries a potentially big benefit: helping catch silent killers like a heart-rhythm disorder known as atrial fibrillation that is missed in many patients who don’t have symptoms. Tripp Mickle, WSJ, "Apple Watch’s New Heart-Monitoring Functions Triggers Health Debate," 13 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fibrillation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of fibrillation

1845, in the meaning defined at sense 1

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Statistics for fibrillation

Last Updated

17 Mar 2019

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Time Traveler for fibrillation

The first known use of fibrillation was in 1845

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More Definitions for fibrillation

fibrillation

noun
fi·​bril·​la·​tion | \ ˌfib-rə-ˈlā-shən How to pronounce fibrillation (audio) , ˌfīb- How to pronounce fibrillation (audio) \

Medical Definition of fibrillation

1 : an act or process of forming fibers or fibrils
2a : a muscular twitching involving individual muscle fibers acting without coordination
b : very rapid irregular contractions of the muscle fibers of the heart resulting in a lack of synchronism between heartbeat and pulse — see atrial fibrillation, ventricular fibrillation

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More from Merriam-Webster on fibrillation

Rhyming Dictionary: Words that rhyme with fibrillation

Spanish Central: Translation of fibrillation

Nglish: Translation of fibrillation for Spanish Speakers

Britannica English: Translation of fibrillation for Arabic Speakers

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