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
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Noun
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. Kim Córdova, New York Times, 25 Feb. 2025 Officials The Coast Guard said the vessel was reported to be a fiberglass Grady-White boat. Christopher Cann, USA TODAY, 24 Feb. 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

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Cite this Entry

“Fiberglass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fiberglass. Accessed 6 Mar. 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)

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