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onium

noun — 3 senses

onium

noun

US /ˈoʊniəm/

Etymology From ammonium.

1

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

2

Chemistry, Natural sciences, Physical sciences Any organic derivative of these compounds.

Derived terms
hydronium

onium

noun

US /ˈɒniəm/

Etymology See Wikipedia at muonium § Nomenclature.

1

Natural sciences, Physical sciences, Physics The bound pair of a particle and its antiparticle.

Derived terms
leptonium, -onium

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.