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


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fiberglassed; fiberglassing; fiberglasses

transitive verb

: to protect or repair by applying fiberglass

Examples of fiberglass in a Sentence

Recent Examples on the Web
The backbone on this rod is excellent thanks to the one-piece graphite and fiberglass construction. Pete M. Anderson, Field & Stream, 28 Sep. 2023 Boasting a fiberglass production capacity of up to 2 million tons, the company operates five production bases worldwide. Will Steakin, ABC News, 8 Nov. 2023 While the fiberglass construction makes this rake inherently light at 2 pounds, its lightness doesn’t detract from its solid build. Gabriel Morgan, Better Homes & Gardens, 27 Oct. 2023 It was followed, in years to come, by stints at other restaurants, a supermarket and a fiberglass factory, and as a day laborer. Marisa Gerber, Los Angeles Times, 19 Oct. 2023 Some furniture pulls double duty, like a green, fiberglass coffee table in the lounge that doubles as a desk. Sarah Yang, Sunset Magazine, 16 Oct. 2023 The blades are self sharpening and last up to five years, and the cutting guards are reinforced with tough fiberglass material to prevent buckling and bending to help with an even trim. Amanda Ogle, Southern Living, 16 Oct. 2023 For fiberglass tubs and surrounds: $695 for a first-time coating. Jeanne Huber, Washington Post, 4 Aug. 2023 Over time, though, both the vintage roadside sign with the flashing neon arrow and the fiberglass pig perched on the restaurant’s roof had started to show signs of their years of neglect. Bob Carlton |, al, 23 Aug. 2023
Then fiberglass the exterior plywood panel seams. Andy Cochrane, Popular Mechanics, 2 Sep. 2021 Nonskid deck wax is similar to fiberglass waxes but is specifically for boats with nonskid decking. Max Inchausti, Field & Stream, 9 Jan. 2023 The sculptures are constructed from a medley of materials, from wood to fiberglass to clay, and their subject matter varies widely as well. Jeanine Barone, Chicago Tribune, 7 Sep. 2022 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'fiberglass.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use


1937, in the meaning defined at sense 1


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.” Dictionary, Merriam-Webster, Accessed 4 Dec. 2023.

Kids Definition


: 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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