Where does “со́лнце” come from?
со́лнце (Russian) comes from Old East Slavic сълньце, from Proto-Slavic sъlnьce, from Proto-Balto-Slavic *súlˀnis, from Proto-Indo-European sóh₂wl̥ — sun.
Ancestry of “со́лнце”, step by step
Words derived from “со́лнце”