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baking powder
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a leavening agent that raises dough by the gas (carbon dioxide) produced when baking soda and acid react in the presence of water: it usually contains baking soda mixed with either starch or flour and cream of tartar or another acid-forming substance, as anhydrous sodium aluminum sulfate
See baking powder in American Heritage Dictionary 4
noun
A mixture of baking soda, starch, and at least one slightly acidic compound such as cream of tartar that works as a leavening agent in baking by releasing carbon dioxide when mixed with a liquid, such as milk or water.
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