- any of various single-celled fungi in which little or no mycelium develops and which ordinarily reproduce by budding: they ferment sugars to form alcohol and carbon dioxide; esp.,
- any of various yeasts (esp. genus Saccharomyces) used in food production, as in making beer, wine, etc. and as a leavening in baking
- any of various yeasts (esp. genus Candida) causing infections or diseases
- brewer's yeast
- the yellowish, moist mass of yeast plants occurring as a froth on fermenting solutions
- this substance dried in flakes or granules or compressed into cakes
- foam; froth
- something that agitates or causes ferment; leaven
- ferment; agitation
Origin of yeastMiddle English yest ; from Old English gist, akin to German gischt, spray, froth and amp; Old High German jesan, to ferment ; from Indo-European base an unverified form yes-, to foam, boil up from source Classical Greek zein, to boil, seethe
Rare to froth or ferment
- a. Any of various unicellular fungi of the genus Saccharomyces, especially S. cerevisiae, reproducing asexually by budding or sexually through the production of ascospores and capable of fermenting carbohydrates.b. Any of numerous fungi that exhibit a one-celled growth form and reproduce by budding, including certain candidas that can cause infections in humans.
- Froth consisting of yeast cells together with the carbon dioxide they produce in the process of fermentation, present in or added to fruit juices and other substances in the production of alcoholic beverages.
- A powdered or compressed commercial preparation of yeast cells, used chiefly as a leavening agent or as a dietary supplement.
- An agent of ferment or activity: political agitators who are the yeast of revolution.
Origin of yeastMiddle English yeest, from Old English gist; see yes- in Indo-European roots.
(countable and uncountable, plural yeasts)
- An often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread, and also used in certain medicines.
- A single-celled fungus of a wide variety of taxonomic families.
- A true yeast or budding yeast in order Saccharomycetales.
- Candida, a ubiquitous fungus that can cause various kinds of infections in humans.
- The resulting infection, candidiasis.
- (figuratively) A frothy foam.
(third-person singular simple present yeasts, present participle yeasting, simple past and past participle yeasted)