Definition of yest

Definition of yest
  1. yest Noun Obsolete spelling of yeast
  2. yeast Noun An often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread, and also used in certain medicines.
  3. yeast Noun A type of single-celled fungus.
  4. yeast Noun A compressed cake or dried granules of this substance used for mixing with flour to make bread dough rise.
  5. yeast Noun A frothy foam.
  6. yeast Verb To exaggerate
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