Where does “υπαίθριος” come from?

υπαίθριος (Greek) comes from Ancient Greek ὑπαίθριος, from Ancient Greek ὕπαιθρος, from Ancient Greek ῠ̔πο-, from Ancient Greek ὑπό, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

υπαίθριος (Greek): outdoor

Definitions

outdoor

Ancestry of “υπαίθριος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὑπαίθριος	under the sky, in the open air, afield
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- →