1. Fermentation; zymolysis: Zymosis explains the kind of fermentation needed especially in the production of ale whereby the temperature is high enough to let the yeast cells rise to the top of the liquid, and is known as "top fermentation".
2. Any infectious disease: Zymosis describes a contagious illness, especially one brought about by a fungus.
3. The development or spread of an infectious disease: It can be considered that the Coronavirus, or COVID-19, is a zymosis, is very virulent, and since March 2020 is raging throughout the world, and can be deadly.