noun Cell Biology.
a threadlike filament of actin or myosin that is a component of a myofibril.
Origin of myofilament
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Any of the ultramicroscopic filaments, made up of actin and myosin, that are the structural units of a myofibril.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.