The Collaborative International Dictionary of English v.0.48:

Necropolis \Ne*crop"o*lis\, n.; pl. Necropolises. [NL., fr.
   Gr. ?; nekro`s a dead body, adj., dead + ? city.]
   A city of the dead; a name given by the ancients to their
   cemeteries, and sometimes applied to modern burial places; a
   graveyard.
   [1913 Webster]