barm barlow • barmaid · · · Info · Definitions · Synonyms · Characters · · barm · · Text Latin · · Script 4 · · Length Definitions · · · (noun) a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey. Synonyms: yeast. · · Noun Definition 1 Synonyms · · · yeast · · Synonym 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 m latin small letter m U+006D r latin small letter r U+0072