n.
Pronunciation: ˌ m ī - ə - ' f ī -br ə l, - ' fi-
Function: noun
Etymology: New Latin myofibrilla, from my- + fibrilla fibril
Date: 1898
: any of the longitudinal parallel contractile elements of a muscle cell that are composed of myosin and actin
– myo · fi · bril · lar \ -br ə -l ə r \ adjective