fiberglass

1 of 2

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

fiberglass

2 of 2

verb

fiberglassed; fiberglassing; fiberglasses

transitive verb

: to protect or repair by applying fiberglass

Examples of fiberglass in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Noun
Weatherman umbrellas are well-loved for their industrial-strength fiberglass frame and water-repellent material. Kristin Braswell, Travel + Leisure, 25 Jan. 2025 The Fine Arts & Exhibits Special Section Giant-Sized Exhibits: A free museum near Route 66 celebrates America’s fiberglass giants and the nostalgia that draws people to them. Amelia Nierenberg, New York Times, 20 Jan. 2025
Verb
Many mattress manufacturers switched to fiberglass as an alternative. Anna Giorgi, Verywell Health, 3 Sep. 2024 Then fiberglass the exterior plywood panel seams. Andy Cochrane, Popular Mechanics, 2 Sep. 2021 See all Example Sentences for fiberglass 

Word History

First Known Use

Noun

1937, in the meaning defined at sense 1

Verb

1967, in the meaning defined above

Time Traveler
The first known use of fiberglass was in 1937

Dictionary Entries Near fiberglass

Cite this Entry

“Fiberglass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiberglass. Accessed 30 Jan. 2025.

Kids Definition

fiberglass

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

More from Merriam-Webster on fiberglass

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