brewer's yeast

noun

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

brewer's yeast

noun

1. a yeast, Saccharomyces cerevisiae , used in brewing See yeast
2. yeast obtained as a by-product of brewing

Word History and Origins

Origin of brewer's yeast¹

First recorded in 1915–20