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What is "brewer's yeast"

Wiktionary
brewer's yeast

n. Any live yeast used in brewing or yeast obtained as a by-product of brewing, dried and killed, and used as nutritional yeast.

WordNet
brewer's yeast

  1. n. yeast used in fermenting beer

  2. used as a leaven in baking and brewing [syn: baker's yeast, Saccharomyces cerevisiae]