Where does “квасъ” come from?

квасъ (Old East Slavic) comes from Proto-Slavic kvasъ, from Proto-Indo-European kwh₂et- — to ferment, become sour; to boil, foam.

Ancestry of “квасъ”, step by step

StepLanguageWordMeaning
1Proto-Slavickvasъleaven, fermented drink
2Proto-Indo-Europeankwh₂et-to ferment, become sour; to boil, foam

Words derived from “квасъ”

Every word from Proto-Indo-European kwh₂et- →Every word from Proto-Slavic kvasъ →