Meaning of osmium tetroxide

os'mium tetrox'ide

Pronunciation: [key]
— Chem. Chem.
  1. a crystalline or amorphous, colorless, poisonous compound, OsO, soluble in water, alcohol, and ether: used for microscopic staining, in photography, and as a catalyst in organic synthesis. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.