Bible Encyclopedias
Barm

1911 Encyclopedia Britannica

(a word common to Teutonic languages), the scum formed on the top of malt liquor when fermenting; yeast used to leaven bread, or to set up fermentation in liquor.

Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Barm'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​b/barm.html. 1910.