a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey
同义词：yeast
barm详细解释
barm n.（名词）The yeasty foam that rises to the surface of fermenting malt liquors.酵母：麦芽酒发酵时，浮在其表面的发酵的泡沫 来源：Middle English berme 中古英语 berme from Old English beorma [yeast] * see bhreu- 源自 古英语 beorma [酵母] *参见 bhreu-
