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
Key Takeaways Atrial fibrillation (afib) diagnosed before age 70 was tied to a 21 percent increased risk of future dementia in a large new study.
—
Tom Gavin, EverydayHealth.com, 1 Apr. 2025
His pacemaker last recorded atrial fibrillation (AFib), an irregular heart rhythm, on Feb. 18.
—Abby Norman, Verywell Health, 11 Mar. 2025
For example, the Pixel Watch, Apple Watch, and others can detect atrial fibrillation (AFib), a type of irregular heartbeat that could indicate an impending stroke or heart attack.
—Ryan Whitwam, Ars Technica, 26 Feb. 2025
Still, who has already had both shoulders replaced and may need knee replacements, thought some of his symptoms like neuropathy, swollen feet, back pains and atrial fibrillation were just the results of his playing days.
—Pj Green, Kansas City Star, 5 Feb. 2025
See All Example Sentences for fibrillation
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Tom Gavin, EverydayHealth.com, 1 Apr. 2025
His pacemaker last recorded atrial fibrillation (AFib), an irregular heart rhythm, on Feb. 18.
—Abby Norman, Verywell Health, 11 Mar. 2025
For example, the Pixel Watch, Apple Watch, and others can detect atrial fibrillation (AFib), a type of irregular heartbeat that could indicate an impending stroke or heart attack.
—Ryan Whitwam, Ars Technica, 26 Feb. 2025
Still, who has already had both shoulders replaced and may need knee replacements, thought some of his symptoms like neuropathy, swollen feet, back pains and atrial fibrillation were just the results of his playing days.
—Pj Green, Kansas City Star, 5 Feb. 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 Apr. 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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