(?le? ?r) n. 1. a thickness of some content laid on or unfold about a area: a layer of soot to the window sill; two layers of paint. 2. bed; stratum: alternating layers of basalt and sandstone. three. someone or matter that lays: a carpet layer. 4. a hen saved for egg manufacturing. 5. certainly one of various things of outfits worn one on top of a