Where does “полъ” come from?

полъ (Old Russian) comes from Proto-Indo-European pleh₂- — flat.

Ancestry of “полъ”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeanpleh₂-flat

Words derived from “полъ

Every word from Proto-Indo-European pleh₂-
полъ — Etymology, Origin & Word History | Etymology Explorer