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fermentation

fur-men-TAY-shuhn /ˌfɜːrmɛnˈteɪʃən/

nounB2SATACTTOEFL

GeneralTechnicalCulinary

A metabolic process in which microorganisms (like yeast or bacteria) convert carbohydrates, such as starch or sugar, into acids, gases, or alcohol under anaerobic conditions.

While often associated with alcohol production, fermentation is also responsible for the sour tang of yogurt, the rise of sourdough bread, and the complex flavors of kimchi and chocolate.

The story behind the word. The word 'fermentation' comes from the Latin 'fermentum' (yeast), which itself derives from 'fervere', meaning 'to boil'. This is because ancient people, observing fruit juice or grain mash bubbling and foaming as it turned into alcohol, thought the liquid was boiling without heat.

Word relationships

anaerobic respiration: The broader biological term for releasing energy without oxygen, while fermentation specifically refers to the chemical breakdown of organic substrates by microbes.

oxidation: A chemical process requiring oxygen, which can break down foods in a different, often non-microbial way.

Commonly confused with

putrefaction: Putrefaction is the decomposition of proteins by anaerobic bacteria, resulting in foul odors, whereas fermentation is the controlled breakdown of carbohydrates.

Word family

ferment (verb): To undergo or cause fermentation.
fermenter (noun): A vessel or organism that performs fermentation.

Collocations

lactic acid fermentation
wild fermentation
fermentation process

Example sentences

"During the overnight fermentation of the dough, yeast produces carbon dioxide bubbles that cause the bread to rise." Describing the bread-making process.
"Fermentation is one of the oldest methods of food preservation, utilizing beneficial microbes to crowd out harmful pathogens." A classic text on food preservation.

Memory hook

Think of 'fermenting' as a wild 'firm party' where tiny yeast cells drink sugar and dance around, releasing bubbles of gas. A firm party of bubbling yeast cells.

When not to use

Do not confuse fermentation with simple spoilage; fermentation is a controlled, desirable biological process, whereas spoilage is uncontrolled decay.

Fun facts

Chocolate cannot be made without fermentation; raw cacao beans are incredibly bitter and only develop their signature chocolate flavor after being fermented under banana leaves for several days.
Vanilla beans also require a lengthy fermentation and curing process to develop the compound vanillin, which gives them their sweet, familiar scent.

Explore more words

ferment, culture, leaven, metabolism, pickle, acidify