Autochthonous

pertaining to autochthons; aboriginal; indigenous ( opposed to heterochthonous ).

Pathology .

found in the part of the body in which it originates, as a cancerous lesion.

found in a locality in which it originates, as an infectious disease.

Psychology . of or pertaining to ideas that arise independently of the individual's own train of thought and seem instead to have some alien or external agency as their source.

Geology . (of rocks, minerals, etc.) formed in the region where found. Compare allochthonous .

adjective

aboriginal , autochthonal , autochthonic , endemic , native , earliest