Where does “νυχθήμερος” come from?

νυχθήμερος (Ancient Greek) comes 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.

νυχθήμερος (Ancient Greek): lasting a day and night

Definitions

lasting a day and night

Ancestry of “νυχθήμερος”, step by step

νυχθήμερος traces back through two separate lines of ancestry.

via Ancient Greek ἡμέρα

Step	Language	Word	Meaning
1	Ancient Greek	ἡμέρα	day; a time of life of a particular type or...
2	Ancient Greek	ἦμαρ	day; by day; midday
3	Proto-Hellenic	ā́mər	day
4	Proto-Indo-European	h₂eh₃mr̥	heat
5	Proto-Indo-European	h₂eh₃-	to be hot; to burn

via Ancient Greek νύξ

Step	Language	Word	Meaning
1	Ancient Greek	νύξ	night
2	Proto-Indo-European	nókʷts	night
3	Proto-Indo-European	negʷ-	bare, naked

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