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yeast
Part of speech: NounLeaven for bread; an organic substance which causes liquor to ferment, dough to rise, etc.; ferment; froth or foam.
Usage examples "yeast":- However, he knew all that there was to know about camp- oven baking, and taught them the art thoroughly, as well as that of making yeast from potatoes. - "Back To Billabong", Mary Grant Bruce.
- Then I saw just the whirling top of it rising out of the flying yeast of a great, black- blustering wave, that was rushing northward before the current that is called the Black- Eddy. - "The Best Psychic Stories", Various.
- A moment after, the captain of the vessel perceiving that the squall was increasing, ordered the topsails to be taken in, whereupon this man with several others instantly ran aloft; the yard was in the act of being hauled down, when a sudden gust of wind whirled it round with violence, and a man was struck down from the cross- trees into the sea, which was working like yeast below. - "The Bible in Spain", George Borrow.