Definition of hydroxonium ion in English:

hydroxonium ion

Line breaks: hy¦drox|onium ion
Pronunciation: /ˌhʌɪdrɒkˈsəʊnɪəm


The ion H3O+, consisting of a protonated water molecule and present in all aqueous acids.
More example sentences
  • Further down this page, we shall calculate the concentration of hydroxonium ions present in pure water.
  • The trajectories of movement of the hydroxyl and hydroxonium ions are cycloids.
  • One assumes that it is the hydroxonium ions but is this necessarily the case?


1920s: hydroxonium from hydro- (relating to hydrogen) + oxy-2 + the suffix -onium (from ammonium).

Definition of hydroxonium ion in:

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cause (someone) to lose confidence or hope; dispirit