Where does “epicentrum” come from?

epicentrum (New Latin) 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 “epicentrum”, step by step

epicentrum traces back through two separate lines of ancestry.

via Ancient Greek ἐπί

Step	Language	Word	Meaning
1	Ancient Greek	ἐπί	as well, besides; For usage in composition, see...
2	Ancient Greek	Ἡμέρα	—
3	Ancient Greek	ἦμαρ	day; by day; midday
4	Proto-Hellenic	ā́mər	day
5	Proto-Indo-European	h₂eh₃mr̥	heat
6	Proto-Indo-European	h₂eh₃-	to be hot; to burn

via Ancient Greek κέντρον

Step	Language	Word	Meaning
1	Ancient Greek	κέντρον	Something with a sharp point: point, spike, spur;...
2	Proto-Hellenic	*kéntron	—
3	Proto-Indo-European	*ḱéntrom	pointed tool

Words derived from “epicentrum”

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