Source : Webster's Revised Unabridged Dictionary (1913)

Tamil \Ta"mil\, a.
   Of or pertaining to the Tamils, or to their language.
   [Written also {Tamul}.]

Tamil \Ta"mil\, n. [Written also Tamul.]
   1. (Ethnol.) One of a Dravidian race of men native of
      Northern Ceylon and Southern India.

   2. The Tamil language, the most important of the Dravidian
      languages. See {Dravidian}, a.

Source : WordNet®

Tamil
     adj : of or relating to a speaker of the Tamil language or the
           language itself; "the Tamil Tigers are fighting the
           Sinhalese in Sri Lanka"; "Tamil agglutinative phrases"
     n 1: a member of the mixed Dravidian and Caucasoid people of
          southern India and Sri Lanka
     2: the Dravidian language spoken since prehistoric times by the
        Tamil people in southern India and Sri Lanka