brewer's yeast

noun
a yeast, as of the genus Saccharomyces, suitable for use as a ferment in the manufacture of wine and beer.

Origin:
1915–20

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Collins
World English Dictionary
brewer's yeast
 
n
1.  See yeast a yeast, Saccharomyces cerevisiae, used in brewing
2.  yeast obtained as a by-product of brewing

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

brewer's yeast brew·er's yeast (brōō'ərz)
n.
A yeast (genus Saccharomyces) used as a source of B-complex vitamins.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Traditional ethanol is made when brewer's yeast feeds on glucose, the sugar found in corn starch and cellulose.
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