fiberglass
noun, verb
fiberglass is a noun meaning “Alternative form of fibreglass” (English Wiktionary, September 2026). It is spelled F-I-B-E-R-G-L-A-S-S and has 3 syllables, and it appears 1.1 times per million words in written English (wordfreq, 2021 data). The plural of fiberglass is fiberglasses.
What does fiberglass mean?
noun
- 1
USAlternative form of fibreglass.
verb
- 1
USAlternative form of fibreglass.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce fiberglass?
- US
Fiberglass has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Flame,_not_lame-fiberglass.wav, Wikimedia Commons (author and licence on each file's page).
Forms of fiberglass
- fiberglasses plural, present, singular, he/she/it
- fiberglassing participle, present
- fiberglassed participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is fiberglass?
Fiberglass appears 1.1 times per million words in written English, the 27,462nd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Words people confuse with fiberglass
Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).
Also written: fibreglass.
Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).