Definition of yeast noun from the Oxford Advanced Learner's Dictionary



BrE BrE//jiːst//
; NAmE NAmE//jiːst//
[uncountable, countable]
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a fungus used in making beer and wine, or to make bread rise 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’.
See the Oxford Advanced American Dictionary entry: yeast