Stratum Definition
strātəm, strătəm
strata, stratums
noun
strata, stratums
A horizontal layer or section of material, esp. any of several lying one upon another.
Webster's New World
A bed or layer of sedimentary rock that is visually distinguishable from adjacent beds or layers.
American Heritage
Any of the socioeconomic groups of a society as determined by birth, income, education, etc.
Webster's New World
Any of the regions of the atmosphere, such as the troposphere, that occur as layers.
American Heritage
A section, level, or division, as of the atmosphere or ocean, regarded as like a stratum.
Webster's New World
Origin of Stratum
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From Latin strātum (“a spread for a bed, coverlet, quilt, blanket; a pillow, bolster; a bed"), neuter singular of strātus, perfect passive participle of sternō (“spread").
From Wiktionary
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Latin strātum a covering from neuter past participle of sternere to spread stratus
From American Heritage Dictionary of the English Language, 5th Edition
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