Fermentation

DEF: A process in which bacteria turn sugar into alcohol.

Merriam-Webster Online Dictionary
fermentation (noun)
1.
a) a chemical change with effervescence
b) an enzymatically controlled anaerobic breakdown of an energy-rich compound (as a carbohydrate to carbon dioxide and alcohol or to an organic acid) , broadly an enzymatically controlled transformation of an organic compound
2.
- ferment