Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for yeast from the 1913 edition of Webster's Revised Unabridged Dictionary. Define yeast using one of the most comprehensive free online dictionaries on the web.

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yeast
Part of Speech: noun
Results: 2
1. Spume, or foam, of water.
2. The foam, or troth ( top yeast), or the sediment ( bottom yeast), of beer or other in fermentation, which contains the yeast plant or its spores, and under certain conditions produces fermentation in saccharine or farinaceous substances; a preparation used for raising dough for bread or cakes, and making it light and puffy; barm; ferment.
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