underlayer

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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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