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

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leaven
Part of Speech: noun
Results: 4
1. Any substance that produces, or is designed to produce, fermentation, as in dough or liquids; esp., a portion of fermenting dough, which, mixed with a larger quantity of dough, produces a general change in the mass, and renders it light; yeast; barm.
2. Anything which makes a general assimilating ( especially a corrupting) change in the mass.
Part of Speech: verb transitive
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