Where does “окно” come from?

окно (Old Church Slavonic) comes from Proto-Slavic okъnò — window.

Ancestry of “окно”, step by step

StepLanguageWordMeaning
1Proto-Slavicokъnòwindow

Words derived from “окно

Every word from Proto-Slavic okъnò
окно — Etymology, Origin & Word History | Etymology Explorer