Where does “ep-” come from?

ep- (English) comes 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.

Ancestry of “ep-”, step by step

StepLanguageWordMeaning
1Ancient Greekἐπίas well, besides; For usage in composition, see...
2Ancient GreekἩμέρα—
3Ancient Greekἦμαρday; by day; midday
4Proto-Hellenicā́mərday
5Proto-Indo-Europeanh₂eh₃mr̥heat
6Proto-Indo-Europeanh₂eh₃-to be hot; to burn

Words derived from “ep-”

Every word from Proto-Indo-European h₂eh₃- →Every word from Proto-Indo-European h₂eh₃mr̥ →Every word from Proto-Hellenic ā́mər →