What is the meaning of Understratum?

(n.) The layer or stratum, of earth on which the mold or soil, rests; subsoil.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). understratum. Retrieved September 20, 2026, from http://smartdefine.org/understratum/definitions/2076810
ChicagoWebster's. 2011. "understratum" http://smartdefine.org/understratum/definitions/2076810 (accessed September 20, 2026).
HarvardWebster's 2011, understratum, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/understratum/definitions/2076810>.
MLAWebster's. "understratum" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/understratum/definitions/2076810>