oxonium compound: Meaning and Definition of

ox•o'ni•um com"pound

Pronunciation: (ok-sō'nē-um), [key]
— Chem. Chem.
  1. a salt formed by the reaction of an acid with an organic compound containing a basic oxygen atom.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.