osmium tetroxide

noun Chemistry.
  1. a 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.

Origin of osmium tetroxide

First recorded in 1875–80
Also called osmic acid.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for osmium tetroxide

osmium tetroxide

noun
  1. a yellowish poisonous water-soluble crystalline substance with a penetrating odour, used as a reagent and catalyst in organic synthesis. Formula: OsO 4
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