Underlayer Definition
  underlayers
  
    noun
  
 A layer that is below another layer.
Wiktionary 
(mining) A perpendicular shaft sunk to cut the lode at any required depth.
Wiktionary 
Other Word Forms of Underlayer
Noun
Singular:
 underlayerPlural:
 underlayersOrigin of Underlayer
-  under- + layer From Wiktionary 
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