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hydrogen ion

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noun
  1. ionized hydrogen of the form H+, found in aqueous solutions of all acids.
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Origin of hydrogen ion

First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for hydrogen ion

hydrogen ion

noun
  1. an ionized hydrogen atom, occurring in plasmas and in aqueous solutions of acids, in which it is solvated by one or more water molecules; proton. Formula: H +
  2. an ionized hydrogen molecule; hydrogen molecular ion. Formula: H 2 +
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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