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tetroxide British & World English

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

osmium tetroxide British & World 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 British & World English

A reddish-brown poisonous gas formed when many metals dissolve in nitric acid

dinitrogen tetroxide in nitrogen dioxide British & World English

A reddish-brown poisonous gas formed when many metals dissolve in nitric acid