Quick definitions from WordNet (layer)

▸ noun:  thin structure composed of a single thickness of cells
▸ noun:  a hen that lays eggs
▸ noun:  single thickness of usually some homogeneous substance
▸ noun:  a relatively thin sheetlike expanse or region lying over or under another
▸ noun:  an abstract place usually conceived as having depth ("A simile has at least two layers of meaning")
▸ verb:  make or form a layer ("Layer the different colored sands")
▸ name:  A surname (very rare: popularity rank in the U.S.: #35366)

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▸ Also see layer