Where does “площадь” come from?

площадь (Old East Slavic) comes from Proto-Slavic ploščadь, from Proto-Slavic ploskъ, from Proto-Balto-Slavic plak-ska-.

Ancestry of “площадь”, step by step

StepLanguageWordMeaning
1Proto-Slavicploščadь—
2Proto-Slavicploskъflat
3Proto-Balto-Slavicplak-ska-—

Words derived from “площадь”

Every word from Proto-Balto-Slavic plak-ska- →Every word from Proto-Slavic ploskъ →Every word from Proto-Slavic ploščadь →