01 n. 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 be…
pl.
Stratums, Strata ((#))
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1.
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.(Geol.)
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2.
A bed or layer artificially made; a course.