The Collaborative International Dictionary of English v.0.48:

Attic \At"tic\, a. [L. Atticus, Gr. ?.]
   Of or pertaining to Attica, in Greece, or to Athens, its
   principal city; marked by such qualities as were
   characteristic of the Athenians; classical; refined.
   [1913 Webster]

   Attic base (Arch.), a peculiar form of molded base for a
      column or pilaster, described by Vitruvius, applied under
      the Roman Empire to the Ionic and Corinthian and "Roman
      Doric" orders, and imitated by the architects of the
      Renaissance.

   Attic faith, inviolable faith.

   Attic purity, special purity of language.

   Attic salt, Attic wit, a poignant, delicate wit, peculiar
      to the Athenians.

   Attic story. See Attic, n.

   Attic style, a style pure and elegant.
      [1913 Webster]