proper noun
Pontus (an ancient kingdom and cultural region covering the eastern half of the southern coast of the Black Sea, in Anatolia in modern Turkey; traditionally Greek-speaking); Pontus (a former province of the Roman Empire covering the western half of the Pontus region unified with Bithynia; in full, Bithynia et Pontus)
Learned borrowing from Latin Pontus, from Ancient Greek Πόντος (Póntos).