1. The branch of chemistry concerned with the properties and actions of enzymes: Since June lived in a grape growing section of the country, she was very interested in studying zymology so she could take over the winery of her parents.
2. The chemistry of fermentation: Zymology deals with the biochemical processes involved in fermentation, with yeast selection and physiology, as well as with the practical issues of beer and wine making.

Fermentation can be simply defined in zymology as the conversion of sugar molecules into ethanol and carbon dioxide with yeast.