Where does “ὑγιεινή” come from?

ὑγιεινή (Ancient Greek) comes from Ancient Greek ὑγιεινός, from Ancient Greek -εινός, from Proto-Hellenic -ehnos, from Proto-Indo-European -es-.

Ancestry of “ὑγιεινή”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὑγιεινός	of health, good for the health, wholesome, sound,...
2	Ancient Greek	-εινός	Usually added to neuter nouns in -ος to form an...
3	Proto-Hellenic	-ehnos	—
4	Proto-Indo-European	-es-	—

ὑγιεινή — Etymology, Origin & Word History | Etymology Explorer