any of various synthetic copolymer textile fibers, as Dynel, containing less than 85 percent but more than 35 percent of acrylonitrile.
Origin of modacrylic fiber
1955–60; mod(ified) + acrylic
Also called mod·a·cryl·ic.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019