WordNet (r) 3.0 (2006):

Stambul
    n 1: the largest city and former capital of Turkey; rebuilt on
         the site of ancient Byzantium by Constantine I in the
         fourth century; renamed Constantinople by Constantine who
         made it the capital of the Byzantine Empire; now the seat
         of the Eastern Orthodox Church [syn: Istanbul, Stambul,
         Stamboul, Constantinople]