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]
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