fiberglass

1 of 2

noun

fi·​ber·​glass ˈfī-bər-ˌglas 

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

Noun

Place these fiberglass sticks on the ground, set them parallel to each other like railroad tracks and align your toes with the shafts. —Bestreviews, Mercury News, 13 May 2025

For less than $50, the paddle features a fiberglass surface and provides a good balance of power and control, helping players develop a versatile playing style. —Jené Luciani Sena May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 12 May 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

Word History

First Known Use

Noun

1937, in the meaning defined at sense 1

Verb

1967, in the meaning defined above

Rhymes for fiberglass

• candlemas
• fibreglass
• hourglass
• isinglass
• lemongrass
• martinmas
• orchardgrass
• overpass
• plexiglas
• plexiglass
• sassafras
• superclass

Kids Definition

fiberglass

noun

fi·​ber·​glass

-ˌglas

: glass in the form of fibers used in making various products (as yarn, insulation, or boats)