1. a. One that lays: a tile layer. b. A hen kept for laying eggs.

2. a. A single thickness of a material covering a surface or forming an overlying part or segment: a layer of dust on the windowsill; a cake with four layers. b. A usually horizontal deposit or expanse; a stratum: layers of sedimentary rock; a layer of warm air. c. A depth or level: a poem with several layers of meaning.

3. Botany. A stem that is covered with soil for rooting while still part of the living plant.

1. To divide or form into layers: layered gravel and charcoal to make a filter.

2. To cut (hair) into different, usually overlapping lengths.

3. Botany. To propagate (a plant) by means of a layer.

1. To form or come apart as layers.

2. Botany. To take root as a result of layering.