Where does “ветъхъ” come from?

ветъхъ (Old East Slavic) comes from Proto-Slavic vetъxъ, from Proto-Balto-Slavic *wétušas, from Proto-Indo-European wēt- — year.

Ancestry of “ветъхъ”, step by step

StepLanguageWordMeaning
1Proto-Slavicvetъxъold, ancient
2Proto-Balto-Slavic*wétušasold, ancient
3Proto-Indo-Europeanwēt-year

Words derived from “ветъхъ”

Every word from Proto-Indo-European wēt- →Every word from Proto-Balto-Slavic *wétušas →Every word from Proto-Slavic vetъxъ →