Where does “hidro-” come from?

hidro- (Spanish) comes from Greek ὑδρο-, from Ancient Greek ὕδωρ, from Proto-Hellenic *údōr.

hidro- (Spanish): hydro-

Definitions

Step	Language	Word	Meaning
1	Greek	ὑδρο-	Alternative form of υδρο-
2	Ancient Greek	ὕδωρ	water; rainwater, rain; sweat
3	Proto-Hellenic	*údōr	—

hidro- — Etymology, Origin & Word History | Etymology Explorer