Meaning of “yeast” in the English Dictionary

"yeast" in British English

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yeastnoun [ C or U ]

uk /jiːst/ us /jiːst/

(Definition of “yeast” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"yeast" in American English

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yeastnoun [ U ]

us /jist/

a type of fungus (= simple organism) that is used in making alcoholic drinks such as beer and wine, and in making bread rise (= swell) and become soft

(Definition of “yeast” from the Cambridge Academic Content Dictionary © Cambridge University Press)