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American Dictionary of the English Language

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Stratum


STRATUM, noun plural stratums or strata. The latter is most common. [Latin , to spread or lay.]

1. In geology and mineralogy, a layer; any species of earth, sand, coal and the like, arranged in a flat form, distinct from the adjacent matter. The thicker strata are called beds; and these beds are sometimes stratified.

2. A bed or layer artificially made.