quass

from The Collaborative International Dictionary of English v.0.48

kvass \kvass\, n. [Russ. kvas'.]
   A thin, sour beer, made by pouring warm water on rye or
   barley meal and letting it ferment, -- much used by the
   Russians. [written also {quas} and {quass}.]
   [1913 Webster + PJC]

from The Collaborative International Dictionary of English v.0.48

Quass \Quass\, n. [Russ. kvas'.]
   A thin, sour beer, made by pouring warm water on rye or
   barley meal and letting it ferment, -- much used by the
   Russians. Called also {kvass}. [written also {kvass} and
   {quas}.]
   [1913 Webster + PJC]

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