onium

== English == === Etymology 1 === From English ammonium. ==== Pronunciation ==== (General American) IPA(key): /ˈoʊniəm/ ==== 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. Hypernyms: cation < ion Hyponyms: ammonium, argonium, arsonium, bismuthonium, bromonium, chloronium, fluoronium, iodonium, oxonium, phosphonium, selenonium, stibonium, sulfonium, sulphonium, telluronium (chemistry) Any organic derivative of these compounds. ===== Derived terms ===== ===== Translations ===== === Etymology 2 === See Wikipedia at muonium § Nomenclature. ==== Pronunciation ==== (General American) IPA(key): /ˈɒniəm/, /ˈoʊniəm/ ==== Noun ==== onium (plural onia) (physics) The bound pair of a particle and its antiparticle. Hyponyms: muonium, true muonium, muononium, positronium, tauonium, toponium ===== Derived terms ===== ===== Translations =====