(geology) The rigid, mechanically strong, outer layer of the Earth; divided into twelve major plates.

Lead monoxide (PbO) a toxic solid formed from the oxidisation of lead in air, and used as a pigment.

(uncountable) The study of rocks, with particular emphasis on their description and classification. / (countable) The general composition of a rock or rock sequence.

(geology) a mechanical analogue of the seismic lithosphere, used to simulate the flexural deformations of the Earth

(geology) the chemical boundary layer between the surface of the Earth and the asthenosphere that contains the material differentiated or extracted from the mantle

(geology) The region of the Earth's crust and mantle over which the flow properties of rock are insufficient to relieve stress.

(geology) the region between the surface of the Earth and the asthenosphere characterized by the efficient propagation of seismic waves

(geology) The thermal boundary layer between the surface of the Earth (cooled by conduction) and the asthenosphere (cooled by convection).

(printing) Related to the method of lithography.

A printed image produced by lithography.