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barm

noun
\ ˈbärm How to pronounce barm (audio) \

Definition of barm

: yeast formed on fermenting malt liquors

First Known Use of barm

before the 12th century, in the meaning defined above

History and Etymology for barm

Middle English berme, from Old English beorma; akin to Middle Low German berm yeast, Latin fermentum yeast, fervēre to boil, Old Irish berbaid he boils

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