Where does “ορεινός” come from?

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

ορεινός (Greek): mountainous

Definitions

mountainous

Ancestry of “ορεινός”, step by step

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

Every word from Proto-Indo-European h₃er- →Every word from Ancient Greek ὄρνυμι →Every word from Ancient Greek ὄρος →