Definitions for understratum
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Wiktionary
understratum(Noun)
The layer, or stratum, of earth on which the soil rests; the subsoil.
Webster Dictionary
Understratum(noun)
the layer, or stratum, of earth on which the mold, or soil, rests; subsoil
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"understratum." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/understratum>.