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The Collaborative International Dictionary of English v.0.48:

Strata \Stra"ta\, n., pl. of Stratum. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Stratum \Stra"tum\, 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]