/ Dictionary / Index B barium oxide: Meaning and Definition of Find definitions for: bar'ium ox'ide Pronunciation: [key] — Chem. Chem. baryta (def. 1). Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barium hydroxide barium peroxide Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language