Stambul (stæm?bu?l) or Stambouln (Placename) the old part of Istanbul, Turkey, south of the Golden Horn: the site of ancient Byzantium; sometimes used as a name for the whole cityCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Stam?bul or Stam?boul (st?m?bul) n. 1. the oldest section of Istanbul. 2. Istanbul. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.