/is'tahn boohl", -tan-; is"tahn bool', -tan-/ ; Turk. /is tahm"bool/ , n.
a port in NW Turkey, on both sides of the Bosporus: built by Constantine I on the site of ancient Byzantium; capital of the Eastern Roman Empire and of the Ottoman Empire; capital removed to Ankara 1923. 5,494,900.
Also, Stambul, Stamboul . Formerly (A.D. 330-1930), Constantinople .