fermentation

US /ˌfɝː.menˈteɪ.ʃən/
UK /ˌfɝː.menˈteɪ.ʃən/
"fermentation" picture
1.

the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat.

:
Yeast is essential for the fermentation of grapes into wine.
The process of fermentation produces alcohol and carbon dioxide.