Definition of "brewer's yeast" [brewer's yeast]

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

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "They ate canned food and alien food, they ate the vitamins and protein powder and brewer's yeast she had supplied and they thrived."