Origin of oro
- < Gr oros, mountain: see orient
From Webster's New World College Dictionary, 5th Edition
- Greek from oros mountain
From American Heritage Dictionary of the English Language, 5th Edition
- From combining form of Ancient Greek á½„ÏÎ¿Ï‚ (oros, “mountain, high ground"), from á½€ÏÎÏƒÎ¸Î±Î¹ (oresthai, “to raise oneself").