Where does “ceroi” come from?

ceroi (Romanian) comes from Romanian cer, from Latin caelum, from Proto-Italic kailom, from Proto-Indo-European keh₂i-lom, from Proto-Indo-European keh₂i-.

Ancestry of “ceroi”, step by step

StepLanguageWordMeaning
1Romaniancersky; heaven; first-person singular present...
2Latincaelumheaven; sky; atmosphere, climate, weather
3Proto-Italickailomsky
4Proto-Indo-Europeankeh₂i-lomwhole
5Proto-Indo-Europeankeh₂i-—
Every word from Proto-Indo-European keh₂i- →Every word from Proto-Indo-European keh₂i-lom →Every word from Proto-Italic kailom →