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Noun: barm  baa(r)m
Usage: Brit
  1. A commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey
    "The baker added barm to the dough to help it rise";
    - yeast

Derived forms: barms

Type of: leaven, leavening

Encyclopedia: Barm, Semnan