barm

(bärm)

noun

the yeast foam that appears on the surface of malt liquors as they ferment

Origin: ME berme < OE beorma, yeast < IE base *bher-, to boil up > ferment, breath

See barm in American Heritage Dictionary 4

noun
The yeasty foam that rises to the surface of fermenting malt liquors.

Origin:

Origin: Middle English berme

Origin: , from Old English beorma, yeast; see bhreu- in Indo-European roots

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