#barm__yeast  a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey
  supertype:  leaven__leavening  a substance used to produce fermentation in dough or a liquid
  subtype:  yeast_cake__yeastcake  small cake of compressed moist yeast
  subtype:  brewer's_yeast  yeast used in fermenting beer
  subtype:  mother.barm  a stringy slimy substance consisting of yeast cells and bacteria; forms during fermentation and is added to cider or wine to produce vinegar

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