Where does “истый” come from?

истый (Russian) comes from Old East Slavic истꙑи, from Proto-Slavic jistъ — true, genuine; same.

истый (Russian): real, true, authentic

Definitions

  1. real, true, authentic

Ancestry of “истый”, step by step

StepLanguageWordMeaning
1Old East Slavicистꙑи—
2Proto-Slavicjistъtrue, genuine; same
Every word from Proto-Slavic jistъ →Every word from Old East Slavic истꙑи →
истый — Etymology, Origin & Word History | Etymology Explorer