: a unicellular fungus that is present and functionally active in yeast, usually has little or no mycelium, and reproduces by budding

Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently …

Dec 18, 2025 · Yeast, any of about 1,500 species of single-celled fungi, several of which are of economic importance or are pathogenic. Yeasts are found worldwide in soils and on plant surfaces …

/ jist / Add to word list a type of fungus (= simple organism) that is used in making alcoholic drinks such as beer and wine, and in making bread rise (= swell) and become soft (Definition of yeast from the …

Yeast is a kind of fungus which is used to make bread rise, and in making alcoholic drinks such as beer. The sugars are fermented with yeast to produce alcohol. Collins COBUILD Advanced Learner’s …

YEAST definition: any 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 …

Definition of yeast noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Any of various one-celled fungi that can cause the fermentation of carbohydrates, producing carbon dioxide and alcohol.

yeast /yist/ 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.

Aug 18, 2025 · Yeast is a microorganism classified within the fungi kingdom. It’s a living organism composed of single-celled fungi that reproduce rapidly under the right conditions. You might think of …