Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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carbon dioxide a colorless, odorless, incombustible gas that is produced naturally in breathing, combustion, and decomposition, and commercially for use in dry ice, fire extinguishers, and carbonated beverages.
nitrogen dioxide a slightly toxic gas composed of nitrogen and oxygen, found in smog and automotive exhaust, and synthesized for use in nitration and oxidation, and as a catalyst.
sulfur dioxide a colorless, suffocating gas produced by the combustion of sulfur, used in the manufacture of sulfuric acid and for other industrial purposes.
titanium dioxide a powder used as a white pigment in paint and ceramic glaze and in white rubber, plastic, and the like.