Meaning & use
fermentation
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a chemical process in which microorganisms like yeast or bacteria break down sugars, often producing alcohol, acids, or gases.
See it in a sentence
Fermentation of grape juice produces wine.
The yogurt's tangy flavor comes from the fermentation of milk by bacteria.
A note on using this word
Fermentation is central to producing foods like bread, beer, wine, cheese, and yogurt, and is distinct from ordinary spoilage because it's driven by specific, often beneficial, microorganisms.
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