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yeast

noun
🔊/jiːst/
🔊/jiːst/
 [uncountable, countable]
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  1. a fungus used in making beer and wine, or to make bread rise酵母；酵母菌Topics Cooking and eatingc2
    Oxford Collocations DictionaryYeast is used before these nouns:
    • extract
    • infection
    See full entry
    Word OriginOld English, of Germanic origin; related to Dutch gist and German Gischt ‘froth, yeast’, from an Indo-European root shared by Greek zein ‘to boil’.