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allochthon

American  
[uh-lok-thuhn, -thon] / əˈlɒk θən, -θɒn /

noun

Geology.

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

Etymology

Origin of allochthon

First recorded in 1940–45; back formation from allochthonous

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.