Layer

One who, or that which, lays.

That which is laid; a stratum; a bed; one thickness, course, or fold laid over another; as, a layer of clay or of sand in the earth; a layer of bricks, or of plaster; the layers of an onion.

A shoot or twig of a plant, not detached from the stock, laid under ground for growth or propagation.

An artificial oyster bed.

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"

thin structure composed of a single thickness of cells

a hen that lays eggs

single thickness of usually some homogeneous substance; "slices of hard-boiled egg on a bed of spinach"

a relatively thin sheetlike expanse or region lying over or under another