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BNC: 35255 COCA: 32521

substratum

noun
/ˈsʌbstrɑːtəm/
/ˈsʌbstreɪtəm/
(plural substrata
/ˈsʌbstrɑːtə/
/ˈsʌbstreɪtə/
)
(specialist)
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  1. a layer of something, especially rock or soil, that is below another layer(尤指岩石或土壤的)下卧层;底土层
    • a substratum of clay粘土底层
    • the substrata of society社会底层
    Word Originmid 17th cent.: modern Latin, neuter past participle (used as a noun) of Latin substernere, from sub- ‘below’ + sternere ‘strew’. Compare with stratum.

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