polyacrylonitrile

noun
poly·​ac·​ry·​lo·​ni·​trile | \ˌpä-lē-ˌa-krə-lō-ˈnī-trəl, -ˌtrēl\

Definition of polyacrylonitrile 

: a polymer of acrylonitrile used often as fibers

First Known Use of polyacrylonitrile

1935, in the meaning defined above

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The first known use of polyacrylonitrile was in 1935

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