Kvass definitions

kväs
A Russian fermented beverage similar to beer, made from rye or barley.
noun
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A Russian fermented drink made from rye, barley, rye bread, etc. and often flavored.
noun
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A type of traditional fermented Russian beverage with little or no alcohol, made from bread, often flavored with fruit.
noun
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Origin of kvass

Russian kvas from Old Russian kvasŭ