Allochthon

//əˈlɒkθən// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon.

Etymology

1940-45; back formation from allochthonous.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.