Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of understratum is as below...

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

Understratums :: Understratums (pl. ) of Understratu.

Undersoil :: Undersoil (n.) The soil beneath the surface; understratum; subsoil.

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