Ferment
Part of speech: verb
Definition: To react, using fermentation; especially to produce alcohol by allowing yeast to act on sugars; to brew. To stir up, agitate, cause unrest.
Part of speech: noun
Definition: Something, such as a yeast that causes fermentation. A state of agitation or of turbulent change. A catalyst.
Example sentence: Many mainstream winemakers use indigenous yeasts rather than commercially grown ones to ferment their grapes - precisely what natural winemakers advocate.
Zymosis
Part of speech: noun
Definition: A fermentation; hence, an analogous process by which an infectious disease is believed to be developed.A zymotic disease.