BARM

barm. Barm, n. yeast, scum of malt-liquor

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Barm (bärm), n. [[OE. berme, AS. beorma; akin to Sw. bärma, G. bärme, and prob. L. fermentum. √93.]] Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and in brewing; yeast. Shak.