Webster's English Dictionary

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citadel

cit.a.del \'sit-*d-*l, -*-.del\ n [MF citadelle, fr. OIt cittadella, dim. 
   of cittade city, fr.]ML civitat-, civitas - more at CITY 1a: a fortress 
   that commands a city  1b: STRONGHOLD  archaic  2: the protected central 
   structure in a heavily armored warship