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English definition of “yeast”

yeast

noun [C or U]     /jiːst/
a type of fungus that is used in making alcoholic drinks such as beer and wine, and for making bread swell and become light: dried/fresh yeast yeast extractFlour and yeastBacteria, moulds, germs and viruses yeasty     /ˈjiː.sti/ adjective Various qualities of food
(Definition of yeast noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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