footwall

[ foo t-wawl ]
/ ˈfʊtˌwɔl /
|

noun

Mining. the top of the rock stratum underlying a vein or bed of ore.Compare hanging wall(def 1).
Geology. a mass of rock lying beneath a fault plane.

Origin of footwall

First recorded in 1640–50; foot + wall
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for footwall

British Dictionary definitions for footwall

footwall

/ (ˈfʊtˌwɔːl) /

noun

the rocks on the lower side of an inclined fault plane or mineral veinCompare 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

Science definitions for footwall

footwall

[ futwôl′ ]

The block of rock lying under an inclined geologic fault plane. See more at fault. Compare hanging wall.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.