modacrylic fiber

noun

mod·​acryl·​ic fiber ˌmä-də-ˈkri-lik- 

: any of various synthetic textile fibers that are long-chain polymers composed of 35 to 85 percent by weight of acrylonitrile units

Word History

Etymology

modified acrylic

First Known Use

1960, in the meaning defined above

Kids Definition

modacrylic fiber

noun

mod·​acryl·​ic fiber ˌmȧd-ə-ˌkril-ik- 

: a synthetic fiber used for clothing that dries quickly and resists burning