NOUN (1)

1. a native or inhabitant of Naples;


ADJECTIVE (1)

1. of or relating to or characteristic of Naples or its people;

The Collaborative International Dictionary of English v.0.48:

Neapolitan \Ne`a*pol"i*tan\, prop. a. [L. Neapolitanus, fr.
   Neapolis Naples, Gr. ?, lit., New town.]
   Of of pertaining to Naples in Italy. -- n. A native or
   citizen of Naples.
   [1913 Webster] Neapolitan ice

WordNet (r) 3.0 (2006):

Neapolitan
    adj 1: of or relating to or characteristic of Naples or its
           people
    n 1: a native or inhabitant of Naples