Barm \Barm\, n. [OE. berme, AS. beorma; akin to Sw. b["a]rma, G. b["a]rme, and prob. L. fermenium. [root]93.]

Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and in brewing; yeast. --Shak.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Barm \Barm\, n. [OE. bearm, berm, barm, AS. beorma; akin to E. bear to support.]

The lap or bosom. [Obs.]

--Chaucer.

Source: Webster's Revised Unabridged Dictionary (1913)