Where does “δεκαπενθήμερο” come from?

δεκαπενθήμερο (Greek) comes from Greek ημέρα, 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.

δεκαπενθήμερο (Greek): fifteen days, two weeks, a fortnight

Definitions

fifteen days, two weeks, a fortnight

Ancestry of “δεκαπενθήμερο”, step by step

δεκαπενθήμερο traces back through two separate lines of ancestry.

via Greek ημέρα

Step	Language	Word	Meaning
1	Greek	ημέρα	day; hours of daylight
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 Greek δεκαπέντε

Step	Language	Word	Meaning
1	Greek	δεκαπέντε	fifteen

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