fiberglass

noun

fi·​ber·​glass ˈfī-bər-ˌglas How to pronounce fiberglass (audio)
1
: glass in fibrous form used in making various products (such as glass wool for insulation)
2
: a composite structural material of plastic and fiberglass

Examples of fiberglass in a Sentence

Recent Examples on the Web
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The owner brought in giant fiberglass statues to help attract visitors to the area. Chelsea Torres, FOXNews.com, 18 May 2026 The all-weather package starts with a 2-in-thick fiberglass-sandwich wall construction with a core of residential-grade insulation. C.c. Weiss may 17, New Atlas, 17 May 2026 But seeing Chicken Boy is its own reward, especially after seeing so many of his fiberglass cousins. Los Angeles Times, 12 May 2026 Each thick, glass torch in this three-pack is designed to sit on a flat surface like a table or bar top, and features a long-lasting fiberglass wick. Stephanie Osmanski, Better Homes & Gardens, 10 May 2026 See All Example Sentences for fiberglass

Word History

First Known Use

1937, in the meaning defined at sense 1

Time Traveler
The first known use of fiberglass was in 1937

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Cite this Entry

“Fiberglass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiberglass. Accessed 10 Jun. 2026.

Kids Definition

fiberglass

noun
fi·​ber·​glass
-ˌglas
: glass in the form of fibers used in making various products (as yarn, insulation, or boats)

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