Etymology

-onium

Today it means: Designating an onium particle. Full definition →

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-onium · suffix1

From onium or -on + -ium.

-onium · suffix2

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

From onium.

Etymology from Wiktionary, CC BY-SA 4.0.