onium

From English ammonium.

• (General American) IPA^(key): /ˈoʊniəm/

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onium (plural oniums)

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

   Hypernyms: cation < ion

   Hyponyms: ammonium, argonium, arsonium, bismuthonium, bromonium, chloronium, fluoronium, iodonium, oxonium, phosphonium, selenonium, stibonium, sulfonium, sulphonium, telluronium

3. (chemistry) Any organic derivative of these compounds.

See Wikipedia at muonium § Nomenclature.

• (General American) IPA^(key): /ˈɒniəm/, /ˈoʊniəm/

onium (plural onia)

2. (physics) The bound pair of a particle and its antiparticle.

   Hyponyms: muonium, true muonium, muononium, positronium, tauonium, toponium

• -onium