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dioxide US English

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

carbon dioxide US English

A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis

sulfur dioxide US English

A colorless pungent toxic gas formed by burning sulfur in air

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

titanium dioxide US English

A white unreactive solid that occurs naturally as the mineral rutile and is used extensively as a white pigment

silica US English

A hard, unreactive, colorless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks

silicon dioxide in silica US English

A hard, unreactive, colorless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks


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