Word.ws English Dictionary

-onium

-onium suffix: designating an onium particle.

Suffix (1)

-onium

  1. (particle) Designating an onium particle.

Suffix (2)

-onium

  1. Used 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 of -onium

From onium or -on + -ium.

From onium.

Questions about -onium

What does -onium mean?
-onium means designating an onium particle.
What part of speech is -onium?
-onium is a suffix.

Words near -onium in the dictionary

  1. -on
  2. -oncus
  3. -one
  4. -onic
  5. -onidine
  6. -onium
  7. -onomics
  8. -onomy
  9. -ont
  10. -onym
  11. -onymy

Source and license

Adapted from Wiktionary: -onium (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “-onium.” Word.ws, https://word.ws/-onium. Based on Wiktionary, CC BY-SA 4.0.