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Meaning of allochthon

al•loch•thon

Pronunciation: (u-lok'thun, -thon), [key]
— n. Geol.
  1. a geological formation not formed in the region where found and moved to its present location by tectonic forces. Cf. autochthon (def. 3).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.