Definition of brewer's yeast
: a yeast used or suitable for use in brewing; specifically : the dried pulverized cells of such a yeast (Saccharomyces cerevisiae) used especially as a source of B-complex vitamins
First Known Use of brewer's yeast
Medical Definition of brewer's yeast
: the dried pulverized cells of a yeast of the genus Saccharomyces (S. cerevisiae) used in brewing and especially as a source of B-complex vitamins
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