A port in Turkey on the Bosporus, lying partly in Europe, partly in Asia; population 10,757,300 (est. 2007). Formerly the Roman city of Constantinople (330–1453), it was built on the site of the ancient Greek city of Byzantium. It was captured by the Ottoman Turks in 1453 and was the capital of Turkey from that time until 1923.
Turkish, from Greek eis tēn polin 'into the city'.
Definition of Istanbul in:
- The US English dictionary