layer
     n 1: single thickness of usually some homogeneous substance;
          "slices of hard-boiled egg on a bed of spinach" [syn: {bed}]
     2: a relatively thin sheetlike expanse or region lying over or
        under another
     3: an abstract place usually conceived as having depth; "a good
        actor communicates on several levels"; "a simile has at
        least two layers of meaning"; "the mind functions on many
        strata simultaneously" [syn: {level}, {stratum}]
     4: a hen that lays eggs
     5: thin structure composed of a single thickness of cells
     v : make or form a layer; "layer the different colored sands"
Source: WordNet® 2.0