prepreg

noun
pre·preg | \ ˌprē-ˈpreg , ˈprē-ˌpreg \

Definition of prepreg 

: a reinforcing or molding material (such as paper or glass cloth) already impregnated with a synthetic resin

First Known Use of prepreg

1954, in the meaning defined above

History and Etymology for prepreg

pre- + impregnated

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The first known use of prepreg was in 1954

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