baker's yeast

English Thesaurus

1. used as a leaven in baking and brewing (noun.plant)

hypernym	:	yeast,
definition	:	any of various single-celled fungi that reproduce asexually by budding or division (noun.plant)

member meronym	:	genus saccharomyces, saccharomyces,
definition	:	single-celled yeasts that reproduce asexually by budding; used to ferment carbohydrates (noun.plant)