Did you know that 'kvass' is actually Russian?

'Kvass' is a word borrowed from Russian 'kvas'. The word entered the English language some time around 1553.

kvass [noun] [circa 1553]

A slightly alcoholic beverage of eastern Europe made from fermented mixed cereals and often flavored

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note: Kvass (pronounced kvahs) is a traditional Slavic fermented low-alcohol beverage made from rye bread. The word comes from the Old East Slavic *kvasŭ (leaven fermented drink) rooted in the Proto-Slavic *kvasu which means sour or leaven. It is ultimately derived from the Proto-Indo-European root *kwh₂et- (to become sour or to ferment).
Etymology: Russian 'kvas'

See more loan words from 1500s.