Where does “oreo-” come from?

oreo- (English) comes from Ancient Greek ὄρος, from Ancient Greek ὄρνυμι, from Proto-Indo-European h₃er- — to move, to stir; to rise, to spring; to quarrel,...

Ancestry of “oreo-”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὄρος	a mountain, hill; mountain chain; district,...
2	Ancient Greek	ὄρνυμι	to set upon, let loose upon, move on; to awaken,...
3	Proto-Indo-European	h₃er-	to move, to stir; to rise, to spring; to quarrel,...

Words derived from “oreo-”

oreographic
oreography

Every word from Proto-Indo-European h₃er- →

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