oxonium
/ɒkˈsəʊnɪ.əm/noun
oxonium is a noun meaning “Any univalent oxygen cation derived from water, the simplest of which is the hydronium ion (H₃O⁺)” (English Wiktionary, September 2026). It is spelled O-X-O-N-I-U-M, and it appears about once in every 93 million words in written English (wordfreq, 2021 data). The plural of oxonium is oxoniums.
What does oxonium mean?
noun
- 1
Any univalent oxygen cation derived from water, the simplest of which is the hydronium ion (H₃O⁺).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce oxonium?
- UK /ɒkˈsəʊnɪ.əm/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Tesco250-oxonium.wav, Wikimedia Commons (author and licence on each file's page).
Forms of oxonium
- oxoniums plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is oxonium?
Oxonium appears about once in every 93 million words in written English, the 309,272nd 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).
Oxonium in Spanish, French, German and Portuguese
In the sense univalent oxygen cation:
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 oxonium come from?
From ox- + -onium.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).