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
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When he was diagnosed with atrial fibrillation, Cuban used AI to track his medications and his workouts.
—
Marco Quiroz-Gutierrez, Fortune, 2 Oct. 2025
While omega-3 fatty acids in fish oil can lower triglycerides and may support heart health, high doses have been linked to a higher risk of atrial fibrillation (AFib).
—Stephanie Brown, Verywell Health, 19 Sep. 2025
Denver’s altitude can trigger atrial fibrillation.
—Andrew Wagner, Oc Register, 19 Sep. 2025
Suppose a doctor needs to find the best and safest anticoagulant for a 68-year-old patient with atrial fibrillation and chronic kidney disease.
—John Werner, Forbes.com, 8 Sep. 2025
See All Example Sentences for fibrillation
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Marco Quiroz-Gutierrez, Fortune, 2 Oct. 2025
While omega-3 fatty acids in fish oil can lower triglycerides and may support heart health, high doses have been linked to a higher risk of atrial fibrillation (AFib).
—Stephanie Brown, Verywell Health, 19 Sep. 2025
Denver’s altitude can trigger atrial fibrillation.
—Andrew Wagner, Oc Register, 19 Sep. 2025
Suppose a doctor needs to find the best and safest anticoagulant for a 68-year-old patient with atrial fibrillation and chronic kidney disease.
—John Werner, Forbes.com, 8 Sep. 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 7 Oct. 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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