ONIUM

Etymology 1

Noun

onium (plural oniums)

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

(chemistry) any organic derivative of these compounds

Etymology 2

Noun

onium (plural onia)

(physics) the bound pair of a particle and its antiparticle

Source: Wiktionary

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