- autochthonous - of rocks, deposits, etc.; found where they and their constituents were formed
Antonym: allochthonous
- autochthonal, autochthonic, autochthonous, endemic, indigenous - 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"
Antonym: foreign (indirect, via native)