underlayer
Noun

underlayer (plural underlayers)

  1. A layer that is below another layer.
    Synonyms: substrate, substratum
  2. (mining) A perpendicular shaft sunk to cut the lode at any required depth.
  3. One who underlays.
Verb

underlayer (underlayers, present participle underlayering; past and past participle underlayered)

  1. To form a layer beneath another



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