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allochthon

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WordReference Random House Unabridged Dictionary of American English © 2025

al•loch•thon n. [Geol.]

Geologya geological formation not formed in the region where found and moved to its present location by tectonic forces. Cf. autochthon (def. 3).

back formation from allochthonous 1940–45

'allochthon' also found in these entries (note: many are not synonyms or translations):

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