Definition of hydroxonium ion in US English:

hydroxonium ion


  • another term for hydronium ion
    • ‘One assumes that it is the hydroxonium ions but is this necessarily the case?’
    • ‘The complex ion is deprotonated, causing the solution to be acidic from the formation of hydroxonium ions H 3 O +.’
    • ‘The trajectories of movement of the hydroxyl and hydroxonium ions are cycloids.’
    • ‘When acetic acid dissociates in water it loses hydrogen to form the hydroxonium ion, H 3 O +, and the acetate ion.’
    • ‘Further down this page, we shall calculate the concentration of hydroxonium ions present in pure water.’


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


hydroxonium ion

/ˌhīdräkˌsōnēəm ˈīˌän/