Where does “ruō” come from?

ruō (Latin) comes from Proto-Indo-European h₃rew-, from Proto-Indo-European -w-.

Ancestry of “ruō”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	h₃rew-	to run, to hurry
2	Proto-Indo-European	-w-	—

ruō — Etymology, Origin & Word History | Etymology Explorer