Home Misspellings How to spell autoctonous? Autoctonous or autochthonous? Which one is correct? by hersey March 25, 2017 Reading Time: 0min, 7sc + - 0 Autoctonous or Autochthonous Which one is correct? You can find the answer below. Incorrect Autoctonous Correct Autochthonous You can find more information about Autochthonous word here. Rate this post Correct spelling of autoctonousHow do you spell autoctonous?