substratum

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sub|stra|tum /s'ʌbstrɑːtəm, AM -str'eɪt-/ (substrata)
[N-COUNT] with supp, usu N of n
A substratum of something is a layer that lies under the surface of another layer, or a feature that is less obvious than other features. (FORMAL)
...its deep substratum of chalk...

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ablaze

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allowance

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