Dictionary
hy•dro'ni•um i"on
Pronunciation: (hī-drō'nē-um), [key]the hydrogen ion bonded to a molecule of water, H
3O
+, the form in which hydrogen ions are found in aqueous solution. Also called
oxonium ion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.