Where does “ἐφίππιον” come from?

ἐφίππιον (Ancient Greek) 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 “ἐφίππιον”, step by step

ἐφίππιον 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 ἵππος

Step	Language	Word	Meaning
1	Ancient Greek	ἵππος	a horse, a mare; cavalry, horsemen
2	Proto-Hellenic	íkkʷos	horse
3	Proto-Indo-European	h₁éḱwos	stallion, horse
4	Proto-Indo-European	h₁oh₁ḱu-	swift

Words derived from “ἐφίππιον”

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