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Definition of mylar

mylar

/ˈmaɪ.lɑːr/
my · lar
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mylar Lexical Profile

mylar Game Scores & Validity

• noun

1

A thin, strong, flexible polyester film (often coated with a reflective metallic layer) used for packaging, electrical insulation, emergency thermal blankets, and shiny helium balloons.

Example

"The marathon runners were given shiny mylar blankets at the finish line to retain their body heat."

Word Nuance & Usage

Although originally a registered trademark for a specific polyester film (hence often capitalized as 'Mylar'), it is widely used in lowercase as a generic noun for similar shiny, metallized plastic films used in balloons and emergency blankets.

• Nearby Words

myelination
mygalomorph
myitnge
mylar
myna
mynah
myopia

Word Origin & Etymology

Coined in the early 1950s as an arbitrary trademark by the American chemical company DuPont.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Mylar. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/mylar
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