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Synonyms
fi·bril (fī́brəl, fĭb́rəl)

[New Latin fibrilla, diminutive of Latin fibra, fiber.]

noun 

  1. A small slender fiber or filament.
  2. Anatomy Any threadlike fiber or filament, such as a myofibril or neurofibril, that is a constituent of a cell or larger structure.

derivatives

fíbril·lar
adjective
fíbril·losé
adjective