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A gas formed of carbon and oxygen; colorless and odorless; has a somewhat acid taste, and is used for aerating soda water and other beverages; is present naturally in mineral and spring waters. It is present largely in the fissures of the earth and makes the choke-damp of mines. Called also car bon'ic acid. Ep i glot'tis. The valve-like cover that prevents food and drink from entering the larynx.
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