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yeast
[U] Uncountable
This term evokes the biological process of fermentation, where sugar is converted into gas and alcohol. It carries a connotation of growth, expansion, and invisible chemical transformation, often associated with the warmth of a kitchen or the sterility of a laboratory. In a social or political sense, the word is occasionally used to describe a catalyst that triggers a rapid increase in activity or a sudden surge of excitement within a group, mirroring the way the fungus makes bread swell.
Used as a mass noun when referring to the substance in general, such as adding yeast to a recipe.