GNU Collaborative International Dictionary of English

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  1.       

    Stratum , n.; pl. E. Stratums , L. Strata . The latter is more common. [L., from sternere, stratum, to spread; akin to Gr.  to spread, strew. See Strew, and cf. Consternation, Estrade, Prostrate, Stratus, Street.]
    1. (Geol.) A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively.
      1913 Webster
    2. A bed or layer artificially made; a course.
      1913 Webster

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