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  1. Oxford American Dictionary

    substratum

    • IPA[ˈsəbˌstrādəm]

    美式

    • n.
      an underlying layer or substance, in particular a layer of rock or soil beneath the surface of the ground；a foundation or basis of something

    • noun: substratum, plural noun: substrata

    • 釋義

    名詞

    • 1. an underlying layer or substance, in particular a layer of rock or soil beneath the surface of the ground the plant will grow very rapidly and send out runners above the substratum a geological substratum
    • ▪ a foundation or basis of something there is a broad substratum of truth in it