Where does “орѣхъ” come from?

орѣхъ (Old East Slavic) comes from Proto-Slavic orěxъ, from Proto-Indo-European areyis-.

Ancestry of “орѣхъ”, step by step

StepLanguageWordMeaning
1Proto-Slavicorěxъnut; walnut
2Proto-Indo-Europeanareyis-—

Words derived from “орѣхъ”

Every word from Proto-Indo-European areyis- →Every word from Proto-Slavic orěxъ →
орѣхъ — Etymology, Origin & Word History | Etymology Explorer