fibrillation
Americannoun
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the formation of fibrils, or fine fibers or filaments.
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Pathology. uncontrolled twitching or quivering of muscle fibers, such as those of the heart.
noun
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a local and uncontrollable twitching of muscle fibres, esp of the heart, not affecting the entire muscle. Atrial fibrillation results in rapid and irregular heart and pulse rate. In ventricular fibrillation , the heart stops beating
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irregular twitchings of the muscular wall of the heart, often interfering with the normal rhythmic contractions
Etymology
Origin of fibrillation
First recorded in 1830–40; fibrillate + -ion
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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.
He said his struggle intensified following a heart scare during a training run, which led to him being diagnosed with atrial fibrillation - a heart rhythm condition.
From BBC ● Oct. 23, 2026
Recent analyses based on participant-reported health information found that consuming 1-3 cups of caffeinated coffee per day was not associated with a higher risk of atrial fibrillation or abnormal heart rhythm.
From Science Daily ● Jul. 22, 2026
Randomized trials, which are considered the most rigorous and reliable study design, have linked caffeine from coffee to a lower risk of atrial fibrillation.
From Science Daily ● Jul. 22, 2026
Caffeine also blocks a substance that can cause atrial fibrillation, an arrhythmia that can lead to strokes.
From The Wall Street Journal ● Jul. 20, 2026
Then he handed the glass to Camilla and, left hand free, reached down and turned the fibrillation into the opening notes of a Scott Joplin rag.
From "The Secret History" by Donna Tartt
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
