Definition of nitrogen trioxide
: a compound N2O3 obtained at a low temperature as a deep blue unstable liquid that readily decomposes into nitric oxide and nitrogen dioxide; di-nitrogen trioxide —called also nitrogen (III) oxide, nitrous anhydride
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.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 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 nitrogen trioxide? Please tell us where you read or heard it (including the quote, if possible).