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A hydrated hydrogen ion, H3O+. Also called hydronium ion.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
B: As the filtrate travels along the proximal convoluted tubule, sodium is reabsorbed by the cells lining the tubule walls via carbonic anhydrase--an enzyme that produces hydrogen ions which are then exchanged for sodium.
Scientists had hypothesised that hydrogen ions in the solar wind may be the source of most of the Moon's surface water.
The pulp from sour fruits contains more hydrogen ions, giving it a lower pH and a tangy taste that is recognised by acid-sensitive cells in our taste buds.
Cravens and his colleagues report the influx of chemicals from the rings change Saturn's equatorial ionospheric chemistry by converting the hydrogen ions and triatomic hydrogen ions into heavier molecular ions, depleting the planet's ionospheric density.
Because these ions are capable of combining with and neutralizing excess hydrogen ions (H+) upon addition of acid to a body of water, they can help maintain a relatively constant hydrogen ion concentration, and therefore a consistent pH.
The sulfuric acid is made up of positively charged hydrogen ions and negatively charged sulfate ions.
What the water bottle produces is rich with sacrificial hydrogen ions that unite with positively charged molecules, and this is how molecular hydrogen thwarts free radical damage.
The degree of passivation--a ratio of passivated boron concentration [HB] and nonpassivated boron concentration [[B.sup.-]]--is controlled by the concentration [[H.sup.+]] of free (nontrapped) hydrogen ions and the equilibrium dissociation constant K of the HB defect:
This interaction blocks the secretion of hydrogen ions, which combine with chloride ions in the stomach lumen to form gastric acid.3 However, a recent study published in 2017 states that the use of PPIs increases risk of heart failure and death in CAD patients.
Inhibition of this enzyme would be expected to impair intracellular generation of hydrogen ions. (13)
A precise value was measured by [9], who obtained a cross section of 3.86 x [10.sup.-21] [m.sup.2] using photodetachment of negatively charged hydrogen ions [H.sup.-], that is in close agreement with the Bohr model.