footwall

noun
foot·​wall | \ˈfu̇t-ˌwȯl \

Definition of footwall 

1 : the lower underlying wall of a vein, ore deposit, or coal seam in a mine

2 : the lower wall of an inclined fault

First Known Use of footwall

1837, in the meaning defined at sense 1

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The first known use of footwall was in 1837

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