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[ME yest, fr. OE gist; akin to OHG jesen, gesen to ferment, Gk zein to boil] (bef. 12c) 1 a: a yellowish surface froth or sediment that occurs esp. in saccharine liquids (as fruit juices) in which it promotes alcoholic fermentation, consists largely of cells of a fungus (family Saccharomycetaceae), and is used esp. in the making of alcoholic liquors and as a leaven in baking b: a commercial product containing yeast plants in a moist or dry medium c (1): a minute fungus (esp. Saccharomyces cerevisiae) that is present and functionally active in yeast, usu. has little or no mycelium, and reproduces by budding (2): any of various similar fungi |