Definition of yeast in US English:

yeast

noun

  • 1A microscopic fungus consisting of single oval cells that reproduce by budding, and are capable of converting sugar into alcohol and carbon dioxide.

    Genus Saccharomyces, subdivision Ascomycotina

    • ‘They are distributed not only in higher plants but also in algae, yeast, and cyanobacteria.’
    • ‘It involves putting yeast and sugar together in a bottle to create fizz.’
    • ‘The first breakthrough came when Paul Nurse found a yeast gene that controlled the division of yeast cells.’
    • ‘In budding yeast, many genes are induced early in the cell cycle.’
    • ‘This is inferred because spore viability is reduced in some checkpoint single mutants of budding yeast.’
    • ‘The yeast cells in the envelope of yeast are the cells that do the work in your loaf of bread.’
    • ‘Their attempts to genetically engineer spider silk relied on the use of bacterial, yeast, or plant cells.’
    • ‘Some faulty wines undergo a secondary fermentation in the bottle, due to a small amount of yeast and sugar left inadvertently in the wine.’
    • ‘They would break up and rearrange themselves as the yeast cells reproduced.’
    • ‘Alcohol is chock full of sugar, and sugar causes yeast infections in many people.’
    • ‘That sugar reacts with the live yeast to produce more carbon dioxide.’
    • ‘Candida is a single-celled fungus or yeast cell that inhabits the intestinal tract and mucus membranes of every living person on the earth.’
    • ‘The results described above suggest that anesthetics may inhibit yeast cell division by decreasing amino acid import.’
    • ‘I heard and watched the students grasp the understanding of how yeast absorbs sugar.’
    • ‘That's because when there are sufficient nutrients available, normal yeast reproduces asexually.’
    • ‘This method relies on fungi to break the complex sugars of rice into simple sugars that yeast can quickly convert to alcohol.’
    • ‘Yeasts are single-celled plants which utilize sugar in building new yeast cells.’
    • ‘Pour warm water into a bowl, and sprinkle over sugar and yeast.’
    • ‘The yeast uses this sugar in the same way it uses the glucose in white sugar.’
    • ‘And, as each pint contains about eight billion cells of yeast, stressed yeast can dramatically alter taste.’
    • ‘Vitamin C has been shown to increase the activity of specific white blood cells that ingest and destroy bacteria, yeast and certain cancerous cells.’
    • ‘This evolutionarily maintained mechanism has been detected from yeast to mammalian cells.’
    • ‘When you come back to your experiment, you'll notice that yeast cells do a really good job of creating carbon dioxide.’
    • ‘An inability to transport TPP across membranes was directly demonstrated only in yeast and liver cells.’
    • ‘Well, fermentation is nothing less than single-celled yeast fungi busily reproducing - and turning sugar to ethanol in the process.’
    • ‘Drosophila strains were maintained on standard cornmeal / yeast / sugar and agar media.’
    1. 1.1 A grayish-yellow preparation of yeast obtained chiefly from fermented beer, used as a fermenting agent, to raise bread dough, and as a food supplement.
      • ‘They were raised on standard cornmeal medium supplemented with live yeast.’
      • ‘As beer brewers do with yeast, the Wiandts drop bits of mycelia into a malt sugar solution.’
      • ‘The box contains all the ingredients, like the grape juice concentrate, yeast, and stabilizing agents.’
      • ‘The bagel is defined as a hard bread roll made of yeast dough twisted into a doughnutlike shape, cooked in simmering water and then baked.’
      • ‘One of the key ingredients in a home-baked loaf apart from yeast, flour, salt and water - is time.’
      • ‘To make dough, allow yeast to stand in a small bowl until frothy, about 10 minutes.’
      • ‘Like with Mac's in Nelson, there's the pungent, delectable smell of yeast and fermentation.’
      • ‘In yeast breads, use a bit more yeast or let the dough rise longer.’
      • ‘But orgies of organic molecules are not life, just as flour, water, yeast, and salt are not bread.’
      • ‘Each pack contained flour, sunflower oil, sugar, haricot beans, rice, salt, noodles, yeast, and canned food.’
      • ‘When it came time to bake bread, a cup of this live culture would be added to the dough to provide the yeast needed to leaven the bread.’
      • ‘For the last ten years, like a lump of bread dough without yeast, our consumption rates have refused to rise.’
      • ‘This bottle-conditioned ale contains live yeast which allows the beer to develop in the bottle.’
      • ‘Place water, honey and yeast in the food processor and leave until frothy, about 10 minutes.’
      • ‘The inclusion of yeast results in fermentation and causes the dough to rise, if it is left in a warm place.’
      • ‘Added to selective breeding is another step, another human act, that of using yeast to raise the bread or ferment the wine.’
      • ‘Allowing the yeast or other leavening agents to do their duty.’
      • ‘Kvass is a lightly fermented sour-sweet beverage that is commonly made of black bread or grain with yeast and somewhat resembles beer in flavor.’
      • ‘To make the dough, blend the yeast with 4 tbsp water at body temperature.’
      • ‘Not yet available in the market, this bread is made of naturally fermented rice starter dough with no artificial yeast or preservatives added.’
      leavening, ferment, fermentation agent, raising agent, barm, baking powder
      View synonyms
    2. 1.2Biology Any unicellular fungus that reproduces vegetatively by budding or fission, including forms such as candida that can cause disease.
      • ‘The yeast Candida albicans and the beer yeast Saccharomyces cerevisiae have been demonstrated to increase atopic allergy.’
      • ‘Streptomyces rochei AK 39 was active against dermatophytes whereas yeasts and other molds were resistant.’
      • ‘Candida species are polymorphic and can form colonies containing budding yeasts, pseudohyphae, and true hyphae.’
      • ‘Unlike other fungi, budding and fission yeasts lack endogenous DNA methylation.’
      • ‘In budding and fission yeasts, life span is defined by the methods used to measure it.’
      • ‘Each subclass is essential for viability in both budding and fission yeasts; therefore they are not redundant factors.’

Origin

Old English, of Germanic origin; related to Dutch gist and German Gischt ‘froth, yeast’, from an Indo-European root shared by Greek zein ‘to boil’.

Pronunciation

yeast

/yēst//jist/