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

See Examples For:

fiberglass

For a time, my father, Ron, made fiberglass rocks—the kind used in zoos and casinos.

From The Wall Street Journal ● Jun. 16, 2026

But seeing Chicken Boy is its own reward, especially after seeing so many of his fiberglass cousins.

From Los Angeles Times ● May 12, 2026

Cowboy Bob, who is about 20 feet tall, plays guitar and wears a bolo tie, is one of several oversize fiberglass mascots along 11th Street in the Meadow Gold District of Tulsa.

From Los Angeles Times ● May 12, 2026

The district, leaning hard into Route 66’s centenary this year, is marked by five Muffler Men, 20-plus-foot-tall fiberglass statues.

From The Wall Street Journal ● Apr. 24, 2026

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

From "Adrift" by Paul Griffin