adjective (a)

• not corresponding in structure or evolutionary origin(adj.all)

  Synonym:
  heterologic, heterological
  Antonym:
  analogous
  

  source: wordnet30
• derived from organisms of a different but related species(adj.all)

  Example:
  A heterologous graft.
  

  Antonym:
  autologous
  

  source: wordnet30
• Characterized by heterology; consisting of different elements, or of like elements in different proportions; different; -- opposed to homologous; as, heterologous organs.(adjective)

  source: webster1913