мн. уст. yeast sg.
пивные ~ brewer`s yeast, barm
только мн. ч. yeast, barm, leaven ед.
пивные дрожжи — barm, brewer's yeast
ставить на дрожжах — to make with yeast, to leaven
тесто на дрожжах — yeast dough, baker's dough ••
как на дрожжах — (to grow) by leaps and bounds