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WordReference Random House Learner's Dictionary of American English © 2024yeast /yist/USA pronunciation n. - Fungi[countable] a small, single-celled living thing, a fungus, that reproduces by splitting itself or by budding, that is capable of fermenting carbohydrates into alcohol and carbon dioxide.
- Fungi, Nutrition[uncountable] a form of this organism, usually dry powder, used in brewing alcoholic beverages, to make bread rise, and as a source of vitamins and proteins.
WordReference Random House Unabridged Dictionary of American English © 2024yeast (yēst),USA pronunciation n. - Fungiany of various small, single-celled fungi of the phylum Ascomycota that reproduce by fission or budding, the daughter cells often remaining attached, and that are capable of fermenting carbohydrates into alcohol and carbon dioxide.
- Fungi, Nutritionany of several yeasts of the genus Saccharomyces, used in brewing alcoholic beverages, as a leaven in baking breads, and in pharmacology as a source of vitamins and proteins. Cf. bottom yeast, brewer's yeast, top yeast.
- spume;
foam. - ferment;
agitation. - something that causes ferment or agitation.
v.i. - to ferment.
- to be covered with froth.
- bef. 1000; Middle English ye(e)st (noun, nominal), Old English gist, gyst; cognate with Dutch gist, German Gischt yeast, foam, Old Norse jastr yeast, Greek zestós boiled, Sanskrit yásati (it) boils
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