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allochthon

[ uh-lok-thuhn, -thon ]

noun

, Geology.
  1. a geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon ( def 3 ).


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Word History and Origins

Origin of allochthon1

First recorded in 1940–45; back formation from allochthonous

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allochromaticallochthonous