Where does “hypaethral” come from?

hypaethral (English) comes from Latin hypaethrus, from Ancient Greek ὕπαιθρος, from Ancient Greek ῠ̔πο-, from Ancient Greek ὑπό, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

hypaethral (English): Open-air, outdoor, exposed to the sky

Definitions

Open-air, outdoor, exposed to the sky

Ancestry of “hypaethral”, step by step

Step	Language	Word	Meaning
1	Latin	hypaethrus	uncovered
2	Ancient Greek	ὕπαιθρος	under the sky, in the open air
3	Ancient Greek	ῠ̔πο-	under, lower; by, under; under”, “beneath
4	Ancient Greek	ὑπό
5	Proto-Indo-European	upó	under, below
6	Proto-Indo-European	h₃ewp-	—

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Ancient Greek ῠ̔πο- →