Dictionary definitions
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underlayer
From The Collaborative International Dictionary of English v.0.48:
Underlayer \Un"der*lay`er\, n.
1. One who, or that which, underlays or is underlaid; a lower
layer.
[1913 Webster]
2. (Mining) A perpendicular shaft sunk to cut the lode at any
required depth. --Weale.
[1913 Webster]
