Definition of yeast in English:

yeast

Line breaks: yeast
Pronunciation: /jiːst
 
/

noun

[mass noun]
1A microscopic fungus consisting of single oval cells that reproduce by budding, and capable of converting sugar into alcohol and carbon dioxide.
  • Genus Saccharomyces, subdivision Ascomycotina
More example sentences
  • The yeast cells in the envelope of yeast are the cells that do the work in your loaf of bread.
  • I heard and watched the students grasp the understanding of how yeast absorbs sugar.
  • The yeast uses this sugar in the same way it uses the glucose in white sugar.
1.1A greyish-yellow preparation of the yeast fungus obtained chiefly from fermented beer, used as a fermenting agent, to raise bread dough, and as a food supplement.
More example sentences
  • As beer brewers do with yeast, the Wiandts drop bits of mycelia into a malt sugar solution.
  • The inclusion of yeast results in fermentation and causes the dough to rise, if it is left in a warm place.
  • To make dough, allow yeast to stand in a small bowl until frothy, about 10 minutes.
1.2 [count noun] Biology Any unicellular fungus that reproduces vegetatively by budding or fission, including forms such as candida that can cause disease.
More example sentences
  • In budding and fission yeasts, life span is defined by the methods used to measure it.
  • Unlike other fungi, budding and fission yeasts lack endogenous DNA methylation.
  • Candida species are polymorphic and can form colonies containing budding yeasts, pseudohyphae, and true hyphae.

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'.

Derivatives

yeast-like

adjective
More example sentences
  • Thrush is an infection in the mouth caused by a yeast-like organism called Candida albicans.
  • Candidiasis is an infection caused by Candida, a yeast-like fungus.
  • Pneumocystis carinii is a parasitic, sometimes pathogenic, yeast-like fungus found in the lungs of laboratory rats.

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