Meaning of the word substratum in English

What does substratum mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

substratum

US /səbˈstræt̬.əm/
UK /səbˈstræt̬.əm/

Noun

1.

a layer of rock, soil, or similar material that is below another layer:

Example:
A substratum of clay kept moisture close to the topsoil.
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