The Collaborative International Dictionary of English v.0.48:

Arabesque \Ar`a*besque"\, a.
   1. Arabian. [Obs.]
      [1913 Webster]

   2. Relating to, or exhibiting, the style of ornament called
      arabesque; as, arabesque frescoes.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Arabesque \Ar`a*besque"\, n. [F. arabesque, fr. It. arabesco,
   fr. Arabo Arab.]
   A style of ornamentation either painted, inlaid, or carved in
   low relief. It consists of a pattern in which plants, fruits,
   foliage, etc., as well as figures of men and animals, real or
   imaginary, are fantastically interlaced or put together.
   [1913 Webster]

   Note: It was employed in Roman imperial ornamentation, and
         appeared, without the animal figures, in Moorish and
         Arabic decorative art. (See Moresque.) The arabesques
         of the Renaissance were founded on Greco-Roman work.
         [1913 Webster]

WordNet (r) 3.0 (2006):

arabesque
    n 1: position in which the dancer has one leg raised behind and
         arms outstretched in a conventional pose
    2: an ornament that interlaces simulated foliage in an intricate
       design