Definition of yeast:

part of speech: noun

The froth in the working of new beer; the matter that separates from liquids during the vinous fermentation, the froth being called top- yeast, and the deposit bottom- yeast; the preparation used for raising dough for bread; barm.

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Among the anc. Jews, a goat on which the high priest solemnly laid the sins of the people, and which was afterwards driven into the wilderness; any person on whom the faults of another may be fixed. ...