The process of forming into or breaking apart into fibrils; in medicine, involuntary quivering or twitching of muscle fibers, especially in the heart.
From Latin 'fibrilla' (small fiber) plus the suffix '-ation' (from Latin '-atio'), though modern medical usage emphasizes the pathological twitching meaning.
Atrial fibrillation is when your heart's upper chambers flutter uselessly instead of pumping smoothly—it's literally the heart fibrils twitching out of sync, and it affects millions of people worldwide.
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