substratum

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substratum /ˈsʌbˌstreɪtəm/ noun
plural substrata /-ˌstreɪtə/ /ˈsʌbˌstreɪtə/
substratum
/ˈsʌbˌstreɪtəm/
noun
plural substrata /-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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