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Noun: leavening agent
  1. A leavening agent (also known as raising agent or leaven agent) is a substance added to dough or batter to make it lighter and softer.
    "I know I can use chemical leaveners, but I think that using yeast as a leavening agent is more healthy.";
    - raising agent, leaven agent

Type of: additive

Encyclopedia: Leavening agent