layer

(noun) single thickness of usually some homogeneous substance. Synonyms: bed. Example: "Slices of hard-boiled egg on a bed of spinach."

(noun) a relatively thin sheetlike expanse or region lying over or under another.

(noun) an abstract place usually conceived as having depth. Synonyms: level, stratum. Examples: "A good actor communicates on several levels." "A simile has at least two layers of meaning." "The mind functions on many strata simultaneously."

(noun) a hen that lays eggs.

(noun) thin structure composed of a single thickness of cells.

(verb) make or form a layer. Example: "Layer the different colored sands."