[is-tahn-bool, -tan-; is-tahn-bool, -tan-; Turkish is-tahm-bool]
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.
Also, Stambul, Stamboul.
Formerly (a.d. 330–1930) Constantinople. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Istanbul (ˌɪstænˈbuːl)
Ancient name: Byzantium, Former name (330--1926): Constantinople a port in NW Turkey, on the western (European) shore of the Bosporus: the largest city in Turkey; founded in about 660 bc by Greeks; refounded by Constantine the Great in 330 ad as the capital of the Eastern Roman Empire; taken by the Turks in 1453 and remained capital of the Ottoman Empire until 1922; industrial centre for shipbuilding, textiles, etc. Pop: 9 760 000 (2005 est))

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

Turk. name of Constantinople, a corruption of Gk. phrase eis tan (ten) polin "into the city," which is how the local Gk. population referred to it. Picked up in Turkish 16c., though Turk. folk etymology traces the name to Islam bol "plenty of Islam." Gk. polis "city"
has been adopted into Turk. as a place-name suffix as -bolu.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
Istanbul [(is-tahm-bool, is-tam-bool, is-tahm-boohl, is-tam-boohl)]

Largest city in Turkey, located in the northwestern part of the country on both sides of the Bosporus.

Note: Formerly called Byzantium, then Constantinople, the city was the capital consecutively of the eastern branch of the Roman Empire, of the Byzantine Empire, and of the Ottoman Empire.
Note: It is the seat of the Eastern Orthodox Church.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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