Underlayer definitions

Underlayer

1) Substratum
Found on https://www.crosswordclues.com/clue/underlayer

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Underlayer

• (n.) One who, or that which, underlays or is underlaid; a lower layer. • (n.) A perpendicular shaft sunk to cut the lode at any required depth.
Found on http://thinkexist.com/dictionary/meaning/underlayer/

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underlayer

a layer lying beneath another; substratum.
Found on https://www.infoplease.com/dictionary/underlayer

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