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layer

noun [C] (MATERIAL)
 
 
/ˈleɪ.ər/ US  //

Definition

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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