nitrogen trioxide

noun

: 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

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now