onium

O1N1I1U1M3
US/ˈoʊniəm/US/ˈɒniəm/

noun

Any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families.

OriginEnglish ammonium ← New Latin ammōnium →
Scrabble 7
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Meanings

onium1

nounonium (plural oniums)

plural oniums

  1. chemistryAny cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families.
  2. chemistryAny organic derivative of these compounds.

onium2

nounonium (plural onia)

plural onia

  1. natural sciencesThe bound pair of a particle and its antiparticle.

Origin

onium · noun

  1. New Latinammōnium
  2. Englishammonium
  3. Englishonium

From ammonium.

Full word history & related roots →

onium · noun

See Wikipedia at muonium § Nomenclature.

Full word history & related roots →

Translations

Chinese Cantonese 鎓 /𬭩
  • 鎓 /𬭩 (jung¹)cation
Chinese Mandarin 鎓 /𬭩
  • 鎓 /𬭩 (wēng)cation
Japanese オニウム, オニウム
  • オニウム (oniumu)cation
  • オニウム (oniumu)bound pair of a particle and its antiparticle
Korean 오늄
  • 오늄 (onyum)cation

Rhymes & wordplay

Rhymes with onium

plutoniumpandemoniumeuphoniumharmoniummeconiumpoloniumpelargoniumpandamoniumIconiumpancuroniumvecuroniumstramoniumfandemoniumhydroniumbalonium-curoniumdecamethoniumdiazoniumfluoroniummeldoniumoxoniumphosphoniumpurdoniumrocuronium
All rhymes →
Cite this entry
APA

onium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/onium

MLA

“onium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/onium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “onium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/onium.

Source: onium on Wiktionary, CC BY-SA 4.0.