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sodium benzoate a sweet odorless white powder, the sodium salt of benzoic acid, used as a food preservative and antiseptic; benzoate of soda.
sodium bicarbonate a white water-soluble powder used as a fire extinguisher and antacid, and in the manufacture of mineral water, baking soda, and sodium salts; bicarbonate of soda; baking soda.
sodium carbonate a grayish-white powder, the anhydrous sodium salt of carbonic acid, used in the manufacture of glass, ceramics, soap, and sodium salts, and in bleaching and water treatment; soda ash. [2 definitions]
sodium chloride a colorless crystalline compound, used as a flavoring and preservative for food; table salt.
sodium cyanide a poisonous white crystalline compound, used in dye manufacture, casehardening alloys, pesticides, and the extraction of metals from ore.
sodium hydroxide a strongly caustic solid, used in petroleum refining and the manufacture of rayon, film, and soap; caustic soda.
sodium hyposulfite see "sodium thiosulfate."
sodium nitrate a white crystalline salt, used in the manufacture of fertilizers, explosives, and glass; Chile saltpeter.
Sodium Pentothal trademark for thiopental.
sodium thiosulfate a white crystalline compound, used as a fixing agent in photography, and as a bleach and antichlor; sodium hyposulfite, hyposulfite, or hypo.
sodium-vapor lamp an electric lamp used for lighting highways and streets, containing sodium and neon and giving off a yellow light.