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

Maritime authorities deployed a patrol boat after receiving information about a fiberglass boat speeding toward a small town in northern Penang state early Friday, said Penang's maritime chief Muhammad Suffi Mohamad Ramli. —ABC News, 17 Apr. 2026

Cruise through Petrified Forest National Park, the only national park that contains a section of the historic road, and stop at quirky attractions like Illinois’ gigantic fiberglass statues that were the pinnacle of advertising in the 1960s. —Meena Thiruvengadam, Travel + Leisure, 10 Apr. 2026

Verb

It's compared usually to fiberglass. —Rachel Raposas, PEOPLE, 31 Mar. 2026

Baking soda shouldn't be mixed with ammonia, bleach, alcohol, or chemical cleaners due to dangerous reactions, and should be used with care on glass, leather, marble, or fiberglass to avoid damage. —Melissa Locker, Southern Living, 15 Mar. 2026

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)