Definition of "mylar" [mylar]

• A polyester film; see PET film (biaxially oriented). (noun)

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• "I put the dust jackets in mylar covers and then read the book with cover on."
• "I have every one of the comics shown here, safely tucked away in mylar, with vapor-phase deacidification sheets between the pages."
• "But if you believe the comics industry, it's going broke selling to just the people who put their comics in mylar bags and stack them in hermetic vaults."