The Collaborative International Dictionary of English v.0.48:

Dravidian \Dra*vid"i*an\, prop. a. [From Skr. Dr[=a]vi[dsdot]a,
   the name of the southern portion of the peninsula of India.]
   (Ethnol.)
   Of or pertaining to the Dravida.
   [1913 Webster]

   Dravidian languages, a group of languages of Southern
      India, which seem to have been the idioms of the natives,
      before the invasion of tribes speaking Sanskrit. Of these
      languages, the Tamil is the most important; Telegu,
      Malayalam, and Kannada are included. These languages are
      distinct from the Indo-European family of languages.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Dravidian
    n 1: a member of one of the aboriginal races of India (pushed
         south by Caucasians and now mixed with them)
    2: a large family of languages spoken in south and central India
       and Sri Lanka [syn: Dravidian, Dravidic, Dravidian
       language]