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substratum

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substratum/ˈsʌbˌstreɪtəm/noun
pluralsubstrata/-ˌstreɪtə//ˈsʌbˌstreɪtə/
substratum
/ˈsʌbˌstreɪtəm/
noun
pluralsubstrata/-ˌstreɪtə//ˈsʌbˌstreɪtə/
Learner's definition of SUBSTRATUM  
[count]
: a layer of something (such as soil or rock) that is under another layer — often used figuratively
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