The Collaborative International Dictionary of English v.0.48:

Arabic \Ar"a*bic\, a. [L. Arabicus, fr. Arabia.]
   Of or pertaining to Arabia or the Arabians.
   [1913 Webster]

   Arabic numerals or figures, the nine digits, 1, 2, 3,
      etc., and the cipher 0.

   Gum arabic. See under Gum.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Arabic \Ar"a*bic\, n.
   The language of the Arabians.
   [1913 Webster]

   Note: The Arabic is a Semitic language, allied to the Hebrew.
         It is very widely diffused, being the language in which
         all Moslems must read the Koran, and is spoken as a
         vernacular tongue in Arabia, Syria, and Northern
         Africa.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Arabic
    adj 1: relating to or characteristic of Arabs; "Arabic
           languages"
    n 1: the Semitic language of the Arabs; spoken in a variety of
         dialects [syn: Arabic, Arabic language]