Pronunciation: (kô'ku-sus),[key] —n.the, 1. Also called Cau'casus Moun'tains. a mountain range in Caucasia, between the Black and Caspian seas, along the border between the Russian Federation, Georgia, and Azerbaijan. Highest peak, Mt. Elbrus, 18,481 ft. (5633 m).
2. Also,Caucasia.a region between the Black and Caspian seas: divided by the Caucasus Mountains into Ciscaucasia in Europe and Transcaucasia in Asia.