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allochthon

noun al·loch·thon \ əˈläkthən , aˈ- , -ˌthän \
variants: or allochthone \-ˌthōn\
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Definition of allochthon

plural -s
: an overthrust block of rocks that have been moved along a fault for a great distance from their place of origin

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Origin and Etymology of allochthon

back-formation from allochthonous

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