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tetroxide US English

An oxide containing four atoms of oxygen in its molecule or empirical formula

osmium tetroxide US English

A poisonous pale yellow solid with a distinctive pungent smell, used in solution as a biological stain (especially for lipids) and fixative

nitrogen dioxide US English

A reddish-brown poisonous gas used in the manufacture of nitric acid. It is also an air pollutant, a constituent of untreated automobile exhaust

dinitrogen tetroxide in nitrogen dioxide US English

A reddish-brown poisonous gas used in the manufacture of nitric acid. It is also an air pollutant, a constituent of untreated automobile exhaust