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Definition of fiberglass
fiberglass
/ˈfaɪbərˌɡlæs/
(UK: fibreglass)
fi · ber · glass
Plural:fiberglasses
•Past Simple:fiberglassed
•Past Participle:fiberglassed
•Present Participle:fiberglassing
fiberglass Lexical Profile
CEFR
B2
Grade
6
Tier
2
Usage
Top 10k
fiberglass Game Scores & Validity
Scrabble US
Scrabble UK
WWF
Wordle Guess
• noun
1
American A strong, lightweight material consisting of fine glass fibers embedded in a resin matrix, commonly used in construction, automotive, and marine manufacturing.
Example
"The boat builder repaired the damaged hull using several layers of fiberglass and epoxy."
Synonyms
View all synonyms for fiberglass• verb
1
American To coat, reinforce, or repair a surface or structure using fiberglass.
Example
"They decided to fiberglass the exterior of the wooden canoe to make it completely waterproof and durable."
Synonyms
View all synonyms for fiberglassWord Origin & Etymology
Coined in the late 1930s as a trademark (Fiberglas) by the Owens-Corning company, formed by combining 'fiber' and 'glass'. It eventually became a generic term for glass-reinforced plastic.
Usage Trend
Historical frequency of usage in published text.
180019102020
Data source: Google Books Ngram Viewer
Cite this Entry
Wordmom. (2026). Definition of Fiberglass. In Wordmom Dictionary. Retrieved Oct 16, 2026, from https://wordmom.com/dictionary/fiberglass