cream of tartar

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cream of tartar Potassium hydrogen tartrate, used with sodium bicarbonate as baking powder because it acts more slowly than tartaric acid and gives a more prolonged evolution of carbon dioxide. This is tartrate baking powder. Also used to ‘invert’ sugar in making boiled sweets.

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cream of tar·tar • n. a white, crystalline, acidic compound, HOOC(CHOH)2COOK, obtained as a by-product of wine fermentation and used chiefly in baking powder.