Meaning of “layer” - Learner’s Dictionary

layer

noun [ C ] us uk /leɪər/
Extra Examples
a thick layer of snowThe middle layer is made of plastic.Wear extra layers of clothing if it's cold.A layer of ice was beginning to form.Add another layer of paint.

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.
layer verb [ T ]

[ often passive ] The potatoes are layered with onion.

(Definition of “layer” from the Cambridge Learner’s Dictionary © Cambridge University Press)