substratum
sub·stra·tum / ˈsəbˌstrātəm; -ˌstra-/ • n. (pl. -ta / -tə/ ) an underlying layer or substance, in particular, a layer of rock or soil beneath the surface of the ground. ∎ a foundation or basis of something: there is a broad substratum of truth in it.
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MICHAEL ALLABY "substratum ." A Dictionary of Ecology. . Encyclopedia.com. 27 Mar. 2025 <https://www.encyclopedia.com>.
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MICHAEL ALLABY "substratum ." A Dictionary of Plant Sciences. . Encyclopedia.com. 27 Mar. 2025 <https://www.encyclopedia.com>.
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MICHAEL ALLABY "substratum ." A Dictionary of Zoology. . Encyclopedia.com. 27 Mar. 2025 <https://www.encyclopedia.com>.
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