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footwall

[foo t-wawl] /ˈfʊtˌwɔl/
noun
1.
Mining. the top of the rock stratum underlying a vein or bed of ore.
Compare hanging wall (def 1).
2.
Geology. a mass of rock lying beneath a fault plane.
Origin
1640-1650
1640-50; foot + wall
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for foot wall

footwall

/ˈfʊtˌwɔːl/
noun
1.
the rocks on the lower side of an inclined fault plane or mineral vein Compare hanging wall
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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foot wall in Science
footwall
  (ft'wôl')   
The block of rock lying under an inclined geologic fault plane. See more at fault. Compare hanging wall.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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