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underclay

4 senses · Free VividLex dictionary · Thesaurus

1. n. A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria. Source: opted
2. A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria. Source: webster
3. A stratum of clay lying beneath a coal bed, often containingthe roots of coal plants, especially the Stigmaria. Source: adambom
4. n. A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria. Source: ecdict

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coal bed beneath clay lying plants roots stigmaria stratum containing

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