Etymology
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kvass (n.)

Russian fermented drink made from rye or barley, 1550s, from Russian kvas, from Old East Slavic kvasŭ, from Proto-Slavic *kvasu "leaven, fermented drink," said to be cognate with Latin caseus "cheese" (see cheese (n.1)).

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Definitions of kvass

kvass (n.)
fermented beverage resembling beer but made from rye or barley;
From wordnet.princeton.edu