1. Something, such as a yeast or barm, that causes fermentation.
  2. A state of agitation or of turbulent change.
  3. A gentle internal motion of the constituent parts of a fluid; fermentation.
  4. A catalyst.


  1. To react, using fermentation; especially to produce alcohol by aging or by allowing yeast to act on sugars; to brew.
  2. To stir up, agitate, cause unrest or excitement in.

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