yeast 
1. a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey • Syn: barm • Derivationally related forms: yeasty • Hypernyms: leaven, leavening • Hyponyms: yeast cake, brewer's yeast, mother 2. any of various single-celled fungi that reproduce asexually by budding or division • Derivationally related forms: yeasty • Hypernyms: fungus • Hyponyms: baker's yeast, brewer's yeast, Saccharomyces cerevisiae, wine-maker's yeast, Saccharomyces ellipsoides • Member Holonyms: Endomycetales, order Endomycetales
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