footwall

[foot-wawl]

foot·wall

[foot-wawl]
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:
1640–50; foot + wall
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Footwall is always a great word to know.
So is slumgullion. Does it mean:
a chattering or flighty, light-headed person.
a stew of meat, vegetables, potatoes, etc.
Collins
World English Dictionary
footwall (ˈfʊtˌwɔːl)
 
n
Compare hanging wall the rocks on the lower side of an inclined fault plane or mineral vein

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
footwall   (ft'wôl')  Pronunciation Key 
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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