yeast
//jiːst//
Noun
yeastSingular
yeastsPlural
1
A microscopic fungus used in baking and brewing to cause fermentation, converting sugars into alcohol and carbon dioxide.
You need to add yeast to the dough to make the bread rise.
2
A preparation containing yeast cells, used as a leavening agent in baking to make dough rise.
Add the yeast to warm water and let it activate before mixing it into the flour.
3
A yellowish frothy substance produced during fermentation.
A layer of yeast formed on top of the fermenting beer.