
1) Brewing yeast 2) Exclusively Saxon word 3) Exclusively Anglo word 4) Fermentation foam 5) Foam during fermentation 6) Froth 7) Froth on malt liquor 8) Leaven 9) Leavening 10) Malt liquor yeast 11) Malt-liquor yeast 12) Word of purely Anglo origin 13) Word with Anglo-Saxon origins 14) Yeast 15) Yeast for Vassar
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https://www.crosswordclues.com/clue/barm

1) Bubble 2) Yeast
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https://www.crosswordclues.com/clue/barm

Liquid yeast appearing as froth on fermenting beer.
Found on
http://brewdudes.wordpress.com/beer-making-terminology/

Barm is the foam, or scum, formed on the top of liquor – fermented alcoholic beverages such as beer or wine, or feedstock for hard liquor or industrial ethanol distillation – when fermenting. It was used to leaven bread, or set up fermentation in a new batch of liquor. Barm, as a leaven, has also been made from ground millet combined with must...
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http://en.wikipedia.org/wiki/Barm

yeast; froth on fermenting liquor
Found on
http://phrontistery.info/b.html

• (n.) The lap or bosom. • (n.) Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and in brewing; yeast.
Found on
http://thinkexist.com/dictionary/meaning/barm/
Barm (bärm)
noun [ Middle English
berme , Anglo-Saxon
beorma ; akin to Swedish
bärma , German
bärme , and probably Latin
fermentum . √93.] Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and in brewing; yeast....
Found on
http://www.encyclo.co.uk/webster/B/15
Barm noun [ Middle English
bearm ,
berm ,
barm , Anglo-Saxon
bearm ; akin to English
bear to support.] The lap or bosom. [ Obsolete]
Chaucer. Found on
http://www.encyclo.co.uk/webster/B/15

yeast.
Found on
http://www2.shu.ac.uk/sfca/glossary.cfm

liquid yeast that appears as froth on fermenting beer. (Can also be used as a verb meaning to pitch or add yeast.)
Found on
https://byo.com/resources/glossary

Liquid yeast appearing as froth on fermenting beer.
Found on
https://www.encyclo.co.uk/local/21582
No exact match found.