Definition of barium oxide
: any oxide of barium; especially : the monoxide BaO obtained usually as a white to grayish toxic powder by heating barium carbonate or barium sulfate with carbon and used chiefly in making barium hydroxide and barium peroxide, in coating cathodes of electron tubes, and as a drying agent
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up barium oxide? Please tell us where you read or heard it (including the quote, if possible).