/ Dictionary / Index X xenon trioxide: Meaning and Definition of Find definitions for: xe'non triox'ide Pronunciation: [key] — Chem. Chem. a colorless, nonvolatile solid, XeO, explosive when dry: in solution it is called xenic acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xenon tetrafluoride Xenophanes Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language