fiberglass

American  

[fahy-ber-glas, -glahs] / ˈfaɪ bərˌglæs, -ˌglɑs /

Or fiber glass

noun

1. a material consisting of extremely fine filaments of glass that are combined in yarn and woven into fabrics, used in masses as a thermal and acoustical insulator, or embedded in various resins to make boat hulls, fishing rods, and the like.

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verb (used with object)

1. to cover or form with fiberglass.

verb (used without object)

1. to use or work with fiberglass.

fiberglass Scientific  

/ fī′bər-glăs′ /

1. A material made up of very fine fibers of glass. Fiberglass is resistant to heat and fire and is used to make various products, such as building insulation and boat hulls. Because the fibers in fiberglass are capable of transmitting light around curves, fiberglass is an important component of fiber optics.

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Etymology

Origin of fiberglass

An Americanism dating back to 1935–40; fiber + glass

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Example Sentences

See Examples For:

fiberglass

Flynn said the company is swapping wooden power poles for steel and fiberglass structures and replacing hundreds of miles of bare wire with insulated, fire-resistant conductor.

From The Wall Street Journal ● Nov. 6, 2026

They placed a fish into a tank already occupied by another fish, with the two separated by a fiberglass mesh barrier and an opaque cover.

From Science Daily ● Oct. 18, 2026

Anchored to the sea floor, the fiberglass and steel device lies invisible below the water's surface.

From BBC ● Oct. 18, 2026

Nearby fields were littered with broken deckchairs, scraps of fiberglass insulation and pieces of wire fencing ripped apart by the fierce winds that struck the village and its surroundings.

From Barron's ● Aug. 25, 2026

The design of my left leg had changed, and the metal poles and clump of metal for a foot had been traded in for fiberglass.

From "Ugly" by Robert Hoge

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