a layer lying beneath another; substratum.

1895–1900; under- + layer

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The entire panel, except for the hands and face, was gilded over an underlayer of red.
Eider down, the fluffy underlayer of feathers, is an excellent insulator.
The ash ponds were constructed by removing topsoil and installing a clay dam keyed into the weathered shale underlayer.
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