ferruginous
/fəˈɹud͡ʒənəs/adjective
ferruginous is an adjective meaning “Synonym of ferrous, of or related to iron” (English Wiktionary, September 2026). It is spelled F-E-R-R-U-G-I-N-O-U-S, and it appears about once in every 6 million words in written English (wordfreq, 2021 data).
What does ferruginous mean?
adjective
- 1
Synonym of ferrous, of or related to iron.
- 2
Synonym of rusty, of or related to rust, rust-colored.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce ferruginous?
- UK /fəˈɹuːd͡ʒɪnəs/
- UK /fəˈɹuːd͡ʒənəs/
- US /fəˈɹud͡ʒənəs/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-ferruginous.wav, Wikimedia Commons (author and licence on each file's page).
Forms of ferruginous
- more ferruginous comparative
- most ferruginous superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is ferruginous?
Ferruginous appears about once in every 6 million words in written English, the 73,203rd 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).
Where does ferruginous come from?
Borrowed from Latin ferrūgineus, from ferrūgo (“rust”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).