Definition of Undercley
Un"der*clay` (?), n. (Geol.) A
stratum of clay lying beneath a coal bed, often containing the roots of
coal plants, especially the Stigmaria.
Un"der*clay` (?), n. (Geol.) A
stratum of clay lying beneath a coal bed, often containing the roots of
coal plants, especially the Stigmaria.
- Webster's Unabridged Dictionary (1913)
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The correct Spelling of this word is: Underclay
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