STRATUM

stratum. Stratum, pl. stratums, or strata, n. bed or layer of earth, covering, row

---

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. 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.
2. 2. A bed or layer artificially made; a course.