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  Dictionary Definition of yeasts

yeast
noun
1. a yellowish, somewhat viscid, semifluid substance consisting of the aggregated cells of certain minute fungi, which appears in saccharine liquids (fruit juices, malt worts, etc.), rising to the top as a froth ( top yeast or surface yeast ) or falling to the bottom as a sediment ( bottom yeast or sediment yeast ), employed to induce fermentation in the manufacture of alcoholic drink, especially beer, and as a leaven to render bread, etc., light and spongy, and also used in medicine.
2. a commercial substance made of living yeast cells and some meal-like material, used in raising dough for bread, etc.
3. a yeast plant.
4. spume or foam.
5. ferment or agitation.
-- verb (i)
6. to ferment.
7. to be covered with froth.
[ME yeest, OE gist, c. G Gischt ]