This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A horizontal layer of material, especially one of several parallel layers arranged one on top of another.

n. Geology A bed or layer of sedimentary rock having approximately the same composition throughout.

n. Any of the regions of the atmosphere, such as the troposphere, that occur as layers.

n. Biology A layer of tissue: the epithelial stratum.

n. A level of society composed of people with similar social, cultural, or economic status.

n. One of a number of layers, levels, or divisions in an organized system: a complex poem with many strata of meaning.

n. One of several parallel horizontal layers of material arranged one on top of another.

n. A layer of sedimentary rock having approximately the same composition throughout.

n. Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.

n. A layer of tissue.

n. A class of society composed of people with similar social, cultural, or economic status.

n. A layer of vegetation, usually of similar height.

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 between beds of other kinds. Also used figuratively.

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

n. A layer of material, formed either naturally or artificially.

n. In archæol. excavations, one of the layers of deposits left by successive civilizations, as in the overlying cities at Hissarlik, the ancient Troy.

n. one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)

n. people having the same social, economic, or educational status

n. an abstract place usually conceived as having depth

"The scrub stratum is composed mainly of Acacia farnesian, and Eysenhardtia polystachya, and herbaceous stratum is composed of Bouteloua filiformis, B. curtipendula, Hilaria cenchroides, Muhlenbergia stricta, and M. rigida."

place   

stratum bacillosum    stratum granulosum    stratum cinereum    stratum glomerulosum    stratum corneum    stratum radiatum    stratum moleculare    stratum mucosum    stratum lacunosum    gonidial stratum   

stratify    stratosphere    stratification   

strata   

course    layer    post    measure    magma    tier   

Chatham    atom    datum   

deposit    layer    formation    ridge    limestone    particle    sediment    mass    crust    slab