Meaning of LAYER in English
1》 a sheet or thickness of material, typically one of several, covering a surface or body.
2》 a person or thing that lays something.
3》 a shoot fastened down to take root while attached to the parent plant.
■ verb [often as adjective ~ed ]
1》 arrange or cut in a ~ or ~s.
2》 propagate (a plant) as a ~.
ME (denoting a mason): from lay 1 + -er 1 .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004