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Mylar

[mahy-lahr]
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Trademark.
  1. a brand of strong, thin polyester film used in photography, recording tapes, and insulation.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for mylars

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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Online Etymology Dictionary, © 2010 Douglas Harper