n.; pl. E. Stratums L. Strata The latter is more common. [ L., from sternere, stratum, to spread; akin to Gr. &unr_; 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 ]
(n) one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
(n) the layer of epidermis just under the stratum corneum or (on the palms and soles) just under the stratum lucidum; contains cells (with visible granules) that die and move to the surface
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