Byzantium

[ bih-zan-shee-uh m, -tee-uh m ]
/ bɪˈzæn ʃi əm, -ti əm /

noun

an ancient Greek city on the Bosporus and the Sea of Marmara: Constantine I rebuilt it and renamed it Constantinople a.d.
Compare Istanbul.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for byzantium

Byzantium

/ (bɪˈzæntɪəm, baɪ-) /

noun

an ancient Greek city on the Bosporus: founded about 660 bc; rebuilt by Constantine I in 330 ad and called Constantinople; present-day Istanbul
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012