an acid, HOOC(CHOH)COOH, a clear, colorless crystal or a white, crystalline powder, found in vegetable tissues and fruit juices and obtained commercially from tartar: it is used in dyeing, photography, medicine, etc.
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A crystalline organic acid that exists in three isomeric forms and occurs widely in plants. It is found in byproducts of wine fermentation and has a wide variety of uses, including to make cream of tartar and baking powder, to add effervescence to beverages, to polish metal, in printing and dyeing, and to make photographic chemicals. Chemical formula:C4H6O6.