Definition of allochthon in English:

allochthon

(also allochthone)

noun

Geology
  • An allochthonous rock or mineral formation; especially a part of a faulted formation that has been displaced by tectonic forces. Contrasted with autochthon.

Origin

Late 19th century; earliest use found in Nature: a weekly journal of science. Apparently from allo- + -chthon.

Pronunciation

allochthon

/əˈlɒkθ(ə)n//əˈlɒkθɒn/