yeast formed on malt liquors while fermenting.

before 1000; Middle English berme, Old English beorma; cognate with Frisian berme, German Bärme, Swedish bärme; akin to ferment Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
barm (bɑːm)
1.  the yeasty froth on fermenting malt liquors
2.  an archaic or dialect word for yeast
[Old English bearm; related to beran to bear, Old Norse barmr barm, Gothic barms, Old High German barm see ferment]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. beorma "yeast, leaven," also "head of a beer," from PIE base *bher- "to boil up" (cf. Du. berm, M.L.G. barm, L. fermentum "substance causing fermentation," Skt. bhurati "moves convulsively, quivers," M.Ir. berbaim "I boil, seethe"), from base *bhreue- "to boil, bubble, effervesce, burn" (see
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
block acceptance reporting mechanism
The American Heritage® Abbreviations Dictionary, Third Edition
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