1. [ noun ] a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey
Synonyms: barm
Related terms: leaven brewer's_yeast mother yeast_cake
2. [ noun ] (botany) any of various single-celled fungi that reproduce asexually by budding or division
Related terms: fungus wine-maker's_yeast baker's_yeast Endomycetales
Similar spelling:   yeasty