necropolis
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A cemetery; freq. used as the name of large cemeteries in or near
cities.

    b. An old or prehistoric burying-place.

    c. pl. in various forms.

  Necropoles may possibly be intended as pl. of necropole, after F. nécropole;
there is, however, no example of such a form in the singular.

    Hence necro{sm}politan a., of or belonging to a necropolis.