Understratum n. : The layer, or stratum, of earth on which the mold, or soil, rests; subsoil.

Example:


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Defination from the web:
understratum in the Online Dictionary. Meaning of understratum. Pronunciation of understratum. Translations of understratum. ... understratum. understratums. understressing. Understrike. Understrike. Understroke. understructure. understructure. understructure ...