a brand of strong, thin polyester film used in photography, recording tapes, and insulation. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for mylar
To combat this problem, printing on imitation vellum and, later, mylar was implemented.
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