fibrillation
noun
fi·bril·la·tion
ˌfi-brə-ˈlā-shən 
ˌfī-
ˌfī-
1
: an act or process of forming fibers or fibrils
2
a
: 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 pro wrestling legend had a history of atrial fibrillation (AFib), a heart condition that causes an irregular and rapid heart rate, Page Six reported on Thursday, citing the Pinellas County Forensic Science Center.
—
Ryan Morik, FOXNews.com, 31 July 2025
Atrial fibrillation, commonly known as AFib, is an irregular heartbeat that can cause clots to form and go into the brain, causing a stroke.
—Nicole Villalpando, Austin American Statesman, 26 July 2025
However, high levels (over 4 g per day) of omega-3s have modestly increased the risk of atrial fibrillation in people with, or at risk for, cardiovascular disease.24 Omega-3s may also cause bad breath, heartburn, nausea, or diarrhea.
—Megan Nunn, Verywell Health, 14 July 2025
City of Round Rock Virtual seminar on atrial fibrillation Feb. 19
If you have been diagnosed with atrial fibrillation, Baylor Scott & White is offering a free, virtual seminar to learn more about managing AFib.
—Austin American Statesman, 2 July 2025
See All Example Sentences for fibrillation
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Ryan Morik, FOXNews.com, 31 July 2025
Atrial fibrillation, commonly known as AFib, is an irregular heartbeat that can cause clots to form and go into the brain, causing a stroke.
—Nicole Villalpando, Austin American Statesman, 26 July 2025
However, high levels (over 4 g per day) of omega-3s have modestly increased the risk of atrial fibrillation in people with, or at risk for, cardiovascular disease.24 Omega-3s may also cause bad breath, heartburn, nausea, or diarrhea.
—Megan Nunn, Verywell Health, 14 July 2025
City of Round Rock Virtual seminar on atrial fibrillation Feb. 19
If you have been diagnosed with atrial fibrillation, Baylor Scott & White is offering a free, virtual seminar to learn more about managing AFib.
—Austin American Statesman, 2 July 2025
See All Example Sentences for fibrillation
Cite this Entry
“Fibrillation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fibrillation. Accessed 12 Aug. 2025.
Copy CitationMedical Definition
fibrillation
noun
fi·bril·la·tion
ˌfib-rə-ˈlā-shən
ˌfīb-
ˌfīb-
1
: an act or process of forming fibers or fibrils
2
a
: 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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