To add a leavening agent to a mixture such as a batter or dough in order to make it rise. See also ammonium bicarbonate; baking powder; baking soda; eggs; yeast.

From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.

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