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Yeast

jiːst

Yeast definitions
noun
yeast yeasts
  1. a microscopic fungus consisting of single oval cells that reproduce by budding, and capable of converting sugar into alcohol and carbon dioxide
    • a greyish-yellow preparation of the yeast fungus obtained chiefly from fermented beer, used as a fermenting agent, to raise bread dough, and as a food supplement
    • any unicellular fungus that reproduces vegetatively by budding or fission, including forms such as candida that can cause disease