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Definition of yeast:

  1. Spume, or foam, of water.
  2. The foam, or troth ( top yeast), or the sediment ( bottom yeast), of beer or other in fermentation, which contains the yeast plant or its spores, and under certain conditions produces fermentation in saccharine or farinaceous substances; a preparation used for raising dough for bread or cakes, and making it light and puffy; barm; ferment.


foam, catalyst, cream, leaven, fizz, zyme, ferment, spume, bubble, amylase, effervesce, head, suds, froth, diastase, change, fungus, leavening, solid, pepsin, lather, barm, enzyme, catalyst, ferment.

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