Yeast Wiki - What is the yeast?

Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The first yeast originated hundreds of millions of years ago, and 1,500 species are currently identified. They are estimated to constitute 1% of all described fungal species. Yeasts are unicellular organisms which evolved from multicellular ancestors, with some species having the ability to develop multicellular characteristics by forming strings of connected budding cells known as pseudohyphae or false hyphae. Yeast sizes vary greatly, depending on species and environment, typically measuring 3–4 µm in diameter, although some yeasts can grow to 40 µm in size. Most yeasts reproduce asexually by mitosis, and many do so by the asymmetric division process known as budding. Yeasts, with their single-celled growth habit, can be contrasted with molds, which grow hyphae. Fungal species that can take both forms (depending on temperature or other conditions) are called dimorphic fungi ("dimorphic" means "having two forms"). By fermentation, the yeast species Saccharomyces cerevisiae converts carbohydrates to carbon dioxide and alcohols – for thousands of years the carbon dioxide has been used in baking and the alcohol in alcoholic beverages. It is also a centrally important model organism in modern cell biology research, and is one of the most thoroughly researched eukaryotic microorganisms. Researchers have used it to gather information about the biology of the eukaryotic cell and ultimately human biology. Other species of yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans. Yeasts have recently been used to generate electricity in microbial fuel cells, and produce ethanol for the biofuel industry. Yeasts do not form a single taxonomic or phylogenetic grouping. The term "yeast" is often taken as a synonym for Saccharomyces cerevisiae, but the phylogenetic diversity of yeasts is shown by their placement in two separate phyla: the Ascomycota and the Basidiomycota. The budding yeasts ("true yeasts") are classified in the order Saccharomycetales, within the phylum Ascomycota..

What does the word yeast mean? Find synonyms, antonyms and the meaning of the word yeast in our free online dictionary! Find words starting with yeast and anagrams of yeast.

Definitions of "yeast"

  • Any of various unicellular fungi of the genus Saccharomyces, especially S. cerevisiae, reproducing by budding and from ascospores and capable of fermenting carbohydrates. noun
  • Any of various similar fungi. noun
  • 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. noun
  • A powdered or compressed commercial preparation, having yeast cells and inert material such as meal and used chiefly as a leavening agent or as a dietary supplement. noun
  • Foam; froth. noun
  • An agent of ferment or activity: political agitators who are the yeast of revolution. noun
  • To ferment. verb-intransitive
  • To froth or foam. verb-intransitive
  • An often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread, and also used in certain medicines. noun
  • A type of single-celled fungus. noun
  • A compressed cake or dried granules of this substance used for mixing with flour to make bread dough rise. noun
  • A frothy foam. noun
  • To ferment. verb
  • To rise. verb
  • The foam, or troth (top yeast), or the sediment (bottom yeast), of beer or other in fermentation, which contains the yeast plant or its spores, and under certain conditions produces fermentation in saccharine or farinaceous substances; a preparation used for raising dough for bread or cakes, and making it light and puffy; barm; ferment. noun
  • Spume, or foam, of water. noun
  • To ferment.
  • A yellowish substance, having an acid reaction, produced during the alcoholic fermentation of saccharine fluids, rising partly to the surface in the form of a frothy, flocculent, viscid matter (top or surface yeast), and partly falling to the bottom (bottom or sediment yeast). noun
  • Spumc or foam of water; froth. noun

The word "yeast" in example sentences

Their flavor become more intense and complex with the longer the yeast is allowed to develop.. [Meet Norton]

Set aside for 5-10 minutes, until the yeast is activated and bubbly.. [Archive 2007-07-01]

Just let me know what the name of the yeast is and where I might find it.. [Kitchen Forum]

The microscopic plants which we call yeast are widely distributed in the air, and float around there until chance brings them in contact with a substance favorable to their growth, such as fruit juices and moist warm batter.. [General Science]

When the fermentation has gone on so long that the yeast begins to look brown, the beer should be tunned; that is, the yeast is removed, and the beer is put into the casks in which it is to remain; and, in general, the beer is not taken down into the cellar till at this period.. [The Lady's Country Companion: or, How to Enjoy a Country Life Rationally]

All yeast is best purified before it is used; that is, the yeast should be put into a vessel, and, cold spring water being poured upon it, they should be stirred together and then left to settle.. [The Lady's Country Companion: or, How to Enjoy a Country Life Rationally]

Its scientists have altered a pathway in yeast similar to one in plants and trees that makes smells and flavors.. [Allylix Sniffs Out Biotech For New Fragrances]

The only time you even hear about yeast is if a winery is using naturally occurring yeasts to ferment a particular wine.. [LENNDEVOURS:]

Put the yeast and milk in the bowl of a stand mixer and, using a wooden spoon, stir until the yeast is dissolved.. [Archive 2009-04-01]

But a packet of active dry yeast is roughly 2 1/2 teaspoons: which do you mean, a packet or 1 teaspoon?. [Jalapeno cheese bun recipe for a proper Texas burger | Homesick Texan]

Although the hepatitis B vaccine is made in yeast cells, no one has ever been shown to be allergic to the yeast proteins contained in the hepatitis B vaccine (see Yeast Allergies).. [Hepatitis B Vaccine]

When yeast is foaming and bubbly, mix in egg and tahini until well incorporated.. [Archive 2009-08-01]

I forgot, in my fervor to make the delicious looking food, that nutritional yeast is not the best of friends with my stomach.. [Archive 2009-08-01]

Needless to say, I kind of forgot that 20 minutes does not a puffy bread make when regular yeast is concerned.. [Archive 2009-01-01]

He isolated flavins in yeast, heart muscle, and variety of other plant materials.. [Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms]

In the case of glycolysis and alcohol fermentation in yeast, theoretical models and research clearly formed a positive feed-back loop.. [Otto Meyerhof and the Physiology Institute: the Birth of Modern Biochemistry]

Yeast Translates

TurkishYeast English to Turkish Translate
i. maya,bira mayası;coşkunluk,heyecan;köpük. yeast cake kuru maya somunu.yeast'y s. mayalı, mayaya benzer;köpüklü;ehemmiyetsiz,boş,manasız.i. maya,bira mayası;coşkunluk,heyecan;köpük. yeast cake kuru maya somunu.yeast'y s. mayalı, mayaya benzer;köpüklü;ehemmiyetsiz,boş,manasız.

Yeast on Social Media


@Milloux I make cheese sauce with 2 cups potatoes, 1 cup carrot, cup of water to help it blend smoothly, garlic pow…


me to my boyfriend: good morning sis, let’s get that bread my boyfriend: mornin... yeast... rise


“do you like YEAST in your bread or are you gluten free?!” @aaariah

Yeast Comments

Yeast Videos

Baker's Yeast under the Microscope
Baker's Yeast under the Microscope
Yeast 101
Yeast 101
Cultivate Your Own Wild Yeast Starter
Cultivate Your Own Wild Yeast Starter

Yeast Images

yeast image
yeast image
yeast image
yeast image

News about yeast

China’s lunar lander successfully sprouts cotton on the Moon
A biology experiment on board China’s recent Moon lander has sprouted tiny cotton plants, marking the first time that humans have grown plants on the lunar surface, Xinhua reports.

I started baking bread to spend less time on the internet. It backfired.
In October, I cracked. I didn't tell anyone that I'd reached a breaking point in my relationship with screens, and I didn't try to use any of the many tools or tricks to cut back. Instead, I decided to pick up a new hobby, one that I foolishly thought would n…

China's Moon mission sees first seeds sprout
It marks the first time a plant has been grown in a container on the Moon's surface.


Yeast Word Data

  • Pronunciations(yēst)
  • Character5
  • Hyphenation yeast


Barm Ferment


No yeast hypernyms found!


No yeast equivalents found!
Memory Professor


It is not the mistake that has the most power, instead, it is learning from the mistake to advance your own attributes. (Byron Roberts)
Online IQ Test