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The noun YEAST has 2 senses: 1. a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey. 2. any of various single-celled fungi that reproduce asexually by budding or division. Familiarity information: YEAST used as a noun is rare. Dictionary entry details.
Dough rises because of the yeast present in the ingredients. Yeast, a vital part of making bread, is a mixture of friendly bacterial organisms that feed on the flour. Flour by itself is made from large, simple particles such as starch and sucrose, compounds unable to mix easily with other ingredients.