Where does “cielo” come from?

cielo (Old Leonese) comes from Latin caelum, from Proto-Italic kailom, from Proto-Indo-European keh₂i-lom, from Proto-Indo-European keh₂i-.

Ancestry of “cielo”, step by step

StepLanguageWordMeaning
1Latincaelumheaven; sky; atmosphere, climate, weather
2Proto-Italickailomsky
3Proto-Indo-Europeankeh₂i-lomwhole
4Proto-Indo-Europeankeh₂i-—

Words derived from “cielo”

Every word from Proto-Indo-European keh₂i- →Every word from Proto-Indo-European keh₂i-lom →Every word from Proto-Italic kailom →