layer/ ˈleɪ ər /
noun
a thickness of some material laid on or spread over a surface:
a layer of soot on the window sill; two layers of paint.
bed; stratum:
alternating layers of basalt and sandstone.
verb (used with object)
to make a layer of.
to form or arrange in layers.
verb (used without object)
to separate into or form layers.
(of a garment) to permit of wearing in layers; be used in layering:
Frilly blouses don’t layer well.