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1. Oxford American Dictionary

   hydronium ion

   • IPA[hīˌdrōnēəm ˈīˌän]

   美式

   • n.
     the ion H3O+, consisting of a protonated water molecule and present in all aqueous acids.

   • noun: hydronium ion, plural noun: hydronium ions

2. • 更多解釋

   hydronium ion

   • IPA[hʌɪˈdrəʊnɪəm]

   英式

   • n.
     another term for hydroxonium ion

   Oxford Dictionary