hydrogen ion

noun

ionized hydrogen of the form H+, found in aqueous solutions of all acids.

Origin of hydrogen ion

First recorded in 1895–1900

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hydrogen ion

Historical Examples of hydrogen ion

That is, different concentrations of hydrogen-ion or of hydroxide-ion are required to change their colors.
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2.
Julius Stieglitz
It is very likely that in aqueous acids, a large proportion, at least, of the hydrogen-ion is similarly combined with water.
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2.
Julius Stieglitz
The hydrogen-ion will very decidedly reduce the concentration of the acetate-ion, acetic acid being a weak acid (table, p. 104).
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2.
Julius Stieglitz

British Dictionary definitions for hydrogen ion

hydrogen ion

noun

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 +
an ionized hydrogen molecule; hydrogen molecular ion. Formula: H 2 +

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