Etymology
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fibrillate (v.)

1798, "form into fibrils or fibers," from fibrilla (see fibril) + -ate (2). Related: Fibrillated; fibrillating.

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Definitions of fibrillate

fibrillate (v.)
make fine, irregular, rapid twitching movements;
His heart fibrillated and he died
From wordnet.princeton.edu