WordReference Random House Unabridged Dictionary of American English © 2025
os′mium tetrox′ide, [Chem.]
- Chemistrya crystalline or amorphous, colorless, poisonous compound, OsO4, soluble in water, alcohol, and ether: used for microscopic staining, in photography, and as a catalyst in organic synthesis. Also called os′mic ac′id.
- 1875–80