adjective (a)

• consisting of elements that are not of the same kind or nature(adj.all)

  Example:
  The population of the United States is vast and heterogeneous.
  

  Synonym:
  heterogenous
  Antonym:
  homogeneous, homogenous
  

  source: wordnet30
• originating outside the body(adj.all)

  Antonym:
  autogenic, autogenous
  

  source: wordnet30
• Differing in kind; having unlike qualities; possessed of different characteristics; dissimilar; -- opposed to homogeneous, and said of two or more connected objects, or of a conglomerate mass, considered in respect to the parts of which it is made up.(adjective)

  source: webster1913