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barm (n.)

Old English beorma "yeast, leaven," also "head of a beer," from Proto-Germanic *bhermen- "yeast" (source also of Dutch berm, Middle Low German barm), from suffixed form of PIE root *bhreu- "to boil, bubble, effervesce, burn."

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Definitions of barm from WordNet

barm (n.)
a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey;
Synonyms: yeast
From wordnet.princeton.edu