Noun yeast has 2 senses
  1. yeast, barm - a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey
    --1 is a kind of leaven, leavening
    --1 has particulars: yeast cake; brewer's yeast; mother
  2. yeast - any of various single-celled fungi that reproduce asexually by budding or division
    --2 is a kind of
    fungus
    --2 is a member of Endomycetales, order Endomycetales
    --2 has particulars:
     baker's yeast, brewer's yeast, Saccharomyces cerevisiae; wine-maker's yeast, Saccharomyces ellipsoides
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