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English definition of “layer”

layer

noun [C]     /leɪər/
B2 an amount of a substance covering a surface, or one of several amounts of substance, each on top of the other: the outer/top layer Place alternate layers of pasta and meat sauce in a shallow dish. The shelf was covered in a thick layer of dust.Coverings and layers
layer verb [T] [often passive] The potatoes are layered with onion. → See also the ozone layer
(Definition of layer noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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