UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/bɑːm/US:USA pronunciation: respellingUSA pronunciation: respelling(bärm)

WordReference Random House Unabridged Dictionary of American English © 2020
barm  (bärm),USA pronunciation n. 
  1. Wineyeast formed on malt liquors while fermenting.
  • bef. 1000; Middle English berme, Old English beorma; cognate with Frisian berme, German Bärme, Swedish bärme; akin to ferment

Collins Concise English Dictionary © HarperCollins Publishers::
barm /bɑːm/ n
  1. the yeasty froth on fermenting malt liquors
  2. an archaic or dialect word for yeast
Etymology: Old English bearm; related to beran to bear, Old Norse barmr barm, Gothic barms, Old High German barm see ferment
'barm' also found in these entries (note: many are not synonyms or translations):
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