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 Charge can also be used to an ECG and the Fitbit app, will alert you to any atrial fibrillation (AFib) events. .
—
Larry Magid, Mercury News, 28 Mar. 2025
After further inspecting the device, Jarrell and investigators noticed Hackman’s heart also showed an atrial fibrillation, or irregular heartbeat, the following day, on Feb. 18.
—Rick Jervis, USA TODAY, 9 Mar. 2025
According to one meta-analysis, taking supplements that have more than 1 g of omega-3s increases the risk of atrial fibrillation (irregular heartbeats).30
Additionally, side effects of high-dose supplementation of omega-3s include the following:
Increased fasting blood sugar.
—Allison Herries, Verywell Health, 27 Feb. 2025
The slightest movement can send a victim's heart muscle into wild spasms of ventricular fibrillation.
—Outside Online, 19 Feb. 2025
See All Example Sentences for fibrillation
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Larry Magid, Mercury News, 28 Mar. 2025
After further inspecting the device, Jarrell and investigators noticed Hackman’s heart also showed an atrial fibrillation, or irregular heartbeat, the following day, on Feb. 18.
—Rick Jervis, USA TODAY, 9 Mar. 2025
According to one meta-analysis, taking supplements that have more than 1 g of omega-3s increases the risk of atrial fibrillation (irregular heartbeats).30
Additionally, side effects of high-dose supplementation of omega-3s include the following:
Increased fasting blood sugar.
—Allison Herries, Verywell Health, 27 Feb. 2025
The slightest movement can send a victim's heart muscle into wild spasms of ventricular fibrillation.
—Outside Online, 19 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 19 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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