Etymology
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Mylar (n.)

proper name for a polyester film, 1954, trademarked by E.I. Du Pont de Nemours and Co., Wilmington, Delaware, U.S.A. Like many Du Pont names, it doesn't mean anything, they just liked the sound.

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Definitions of Mylar

Mylar (n.)
a thin polyester film;
From wordnet.princeton.edu