myofibril definitions

WordNet (r) 3.0 (2005)

n
1: one of many contractile filaments that make up a striated muscle fiber [syn: myofibril, myofibrilla, sarcostyle]

Merriam Webster's

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 • myofibrillar adjective

Oxford Reference Dictionary

n. any of the elongated contractile threads found in striated muscle cells.