Where does “vǫsъ” come from?

vǫsъ (Proto-Slavic) comes from Proto-Slavic vǫdsъ, from Proto-Balto-Slavic wónsa, from Proto-Indo-European wondʰsom, from Proto-Indo-European wendʰ- — to wind, to turn.

Ancestry of “vǫsъ”, step by step

StepLanguageWordMeaning
1Proto-Slavicvǫdsъ—
2Proto-Balto-Slavicwónsa—
3Proto-Indo-Europeanwondʰsom—
4Proto-Indo-Europeanwendʰ-to wind, to turn
Every word from Proto-Indo-European wendʰ- →Every word from Proto-Indo-European wondʰsom →Every word from Proto-Balto-Slavic wónsa →