Origin of barmMiddle English berme from Old English beorma, yeast from Indo-European base an unverified form bher-, to boil up from source ferment, breath
Origin of barmMiddle English berme from Old English beorma yeast ; see bhreu- in Indo-European roots.
From Old English bearm.
(countable and uncountable, plural barms)
- Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and in brewing; yeast.
- A small, flat, round individual loaf or roll of bread.