firebrick
noun
firebrick is a noun meaning “a brick capable of withstanding high temperatures without deforming” (English Wiktionary, September 2026). It is spelled F-I-R-E-B-R-I-C-K and has 3 syllables, and it appears about once in every 19 million words in written English (wordfreq, 2021 data). The plural of firebrick is firebricks.
What does firebrick mean?
noun
- 1
a brick capable of withstanding high temperatures without deforming.
- 2
The X11 color name of RGB hexadecimal value #B22222.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce firebrick?
- US
Firebrick 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-firebrick.wav, Wikimedia Commons (author and licence on each file's page).
Forms of firebrick
- firebricks plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is firebrick?
Firebrick appears about once in every 19 million words in written English, the 131,834th 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).
Firebrick in Spanish, French, German and Portuguese
In the sense a brick capable of withstanding high temperatures:
| Language | Words |
|---|---|
| French | brique réfractaire |
| Spanish | ladrillo refractario |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does firebrick come from?
From fire + brick.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).