Definition of substratum noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsʌbstrɑːtəm//
; NAmE NAmE//ˈsʌbstreɪtəm//
(pl. substrata
BrE BrE//ˈsʌbstrɑːtə//
; NAmE NAmE//ˈsʌbstreɪtə//
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a layer of something, especially rock or soil, that is below another layer a substratum of clay the substrata of society Word Originmid 17th cent.: modern Latin, neuter past participle (used as a noun) of Latin substernere, from sub- ‘below’ + sternere ‘strew’. Compare with stratum.
See the Oxford Advanced American Dictionary entry: substratum