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English definition of “layer”

layer

noun [C] (MATERIAL)    /ˈleɪ.ər/ US  //
B2 a level of material , such as a type of rock or gas , that is different from the material above or below it, or a thin sheet of a substance : the ozone layer A thick layer of clay lies over the sandstone . There was a thin layer of oil on the surface of the water . We stripped several layers of paint off the door .Coverings and layers
(Definition of layer noun (MATERIAL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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