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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.
Yeast is a single-celled organism and only certain strains are used for fermenting grain. Yeast activation and the initiation of fermentation are triggered by hydration, from either water or some other liquid, and the presence of a food source. Fermentation ends at 140 degree F during baking when heat kills the yeast.