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hydroxonium ion

noun
  1. a positive ion, H 3 O +, formed by the attachment of a proton to a water molecule: occurs in solutions of acids and behaves like a hydrogen ionAlso called: hydronium ion
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012