-onium

suffix

Designating an onium particle.

“Alternative form: -ium”

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Meanings

-onium1

suffix
  1. particlenatural sciencesDesignating an onium particle.

-onium2

suffix
  1. chemistryUsed to form the name of polyatomic cations. Common examples are quaternary ammonium compounds used as neuromuscular blocking agents, cholinergic agents, anticholinergic agents, antibacterials/antiseptics, or other agents.

    Alternative form: -ium

Origin

-onium · suffix

From onium or -on + -ium.

Full word history & related roots →

-onium · suffix

  1. New Latinammōnium
  2. Englishammonium
  3. Englishonium
  4. English-onium

From onium.

Full word history & related roots →
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.