Definitions for underclay
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Wiktionary
underclay(Noun)
A stratum of clay lying beneath a coal bed.
Webster Dictionary
Underclay(noun)
a stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria
Citation
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"underclay." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/underclay>.