Where does “έφορος” come from?

έφορος (Greek) comes from Ancient Greek ἔφορος, from Ancient Greek ἐπί, from Ancient Greek Ἡμέρα, from Ancient Greek ἦμαρ, from Proto-Hellenic ā́mər, from Proto-Indo-European h₂eh₃mr̥, from Proto-Indo-European h₂eh₃- — to be hot; to burn.

έφορος (Greek): supervisor, superintendent, curator; ephor