hydronium ion

the hydrogen ion bonded to a molecule of water, H 3 O + , the form in which hydrogen ions are found in aqueous solution.
Also called oxonium ion.

< German Hydronium (1907), contraction of Hydroxonium; see hydro-2, oxonium ion

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World English Dictionary
hydronium ion (haɪˈdrəʊnɪəm)
chem another name for hydroxonium ion
[C20: from hydro- + (amm)onium]

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