yeast cake - small cake of compressed moist yeast

brewer's yeast - yeast used in fermenting beer

leaven, leavening - a substance used to produce fermentation in dough or a liquid

mother - a stringy slimy substance consisting of yeast cells and bacteria; forms during fermentation and is added to cider or wine to produce vinegar

fungus - a parasitic plant lacking chlorophyll and leaves and true stems and roots and reproducing by spores

Endomycetales, order Endomycetales - fungi having a zygote or a single cell developing directly into an ascus

baker's yeast, Saccharomyces cerevisiae, brewer's yeast - used as a leaven in baking and brewing

Saccharomyces ellipsoides, wine-maker's yeast - used in making wine