n.
Pronunciation: ' f ī -br ə l, ' fi-
Function: noun
Etymology: New Latin fibrilla, diminutive of Latin fibra
Date: 1664
: a small filament or fiber: as a : ROOT HAIR b (1) : one of the fine threads into which a striated muscle fiber can be longitudinally split (2) : NEUROFIBRIL
– fi · bril · lar \ ' fi-br ə -l ə r, ' f ī - \ adjective