brewer's yeast

  1. a yeast (Saccharomyces cerevisiae) used in brewing beer
  2. the byproduct yeast left after brewing, often used in medicine and foods and as a dietary supplement

See brewer's yeast in American Heritage Dictionary 4

noun
A yeast of the genus Saccharomyces, used as a ferment in brewing and also as a source of B-complex vitamins.

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