Where does “-ουρία” come from?

-ουρία (Ancient Greek) comes from Ancient Greek οὖρον, from Proto-Indo-European h₂wers- — to rain, drip; to rain, sprinkle.

Ancestry of “-ουρία”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	οὖρον	urine; range, space; accusative singular of οὖρος
2	Proto-Indo-European	h₂wers-	to rain, drip; to rain, sprinkle

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