het·er·och·tho·nous \| ̷ ̷ ̷ ̷|räkthənəs\adjective Etymology:heter- + -chthonous (as in autochthonous) 1.: not indigenous : foreign, naturalized < a heterochthonous flora > 2. a.: not formed in the place where it now occurs : transported < heterochthonous rock > b.: removed from the original deposit (as by erosion) and reembedded (as certain fossils)