Wordnet 3.0
ADJECTIVE (1)
1. 
 originating where it is found; 
- Example: "the autochthonal fauna of Australia includes the kangaroo"- Example: "autochthonous rocks and people and folktales"- Example: "endemic folkways"- Example: "the Ainu are indigenous to the northernmost islands of Japan"[syn: autochthonal, autochthonic, autochthonous, endemic, indigenous]
WordNet (r) 3.0 (2006):
autochthonic
    adj 1: originating where it is found; "the autochthonal fauna of
           Australia includes the kangaroo"; "autochthonous rocks
           and people and folktales"; "endemic folkways"; "the Ainu
           are indigenous to the northernmost islands of Japan"
           [syn: autochthonal, autochthonic, autochthonous,
           endemic, indigenous]