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

Example Sentences

To avoid triggering magnetic mines, the hulls are constructed of wood and fiberglass.

From The Wall Street Journal • Mar. 12, 2026

To avoid triggering magnetic mines, the hulls are constructed of wood and fiberglass.

From The Wall Street Journal • Mar. 12, 2026

To avoid triggering magnetic mines, the hulls are constructed of wood and fiberglass.

From The Wall Street Journal • Mar. 12, 2026

At its Gardena factory, L.A.-based Azure creates modules with a composite mixture of fiberglass and recycled plastic bottles, a method that founder Gene Eidelman said was more sustainable and less expensive than concrete.

From Los Angeles Times • May 9, 2025

He pulled a tarp off a fiberglass boat with a shallow hull, maybe twenty feet long.

From "Adrift" by Paul Griffin