noun. A soft crystalline allotrope of carbon, composed of graphene layers, having a steel-gray to black metallic luster and a greasy feel, used in lead pencils, lubricants, paints and coatings, and fabricated into a variety of forms such as molds, bricks, electrodes, crucibles, and rocket nozzles.

noun. Same as graffito. See the extract.

noun. One of the forms under which carbon occurs in nature (see carbon), also known as plumbago and black-lead.

noun. Native carbon in hexagonal crystals, also foliated or granular massive, of black color and metallic luster, and so soft as to leave a trace on paper. It is used for pencils (improperly called lead pencils), for crucibles, and as a lubricator, etc. Often called plumbago or black lead.

noun. a voltaic battery consisting of zinc and carbon in sulphuric acid, or other exciting liquid.

noun. An allotrope of carbon consisting of planes of carbon atoms arranged in hexagonal arrays with the planes stacked loosely that is used as a dry lubricant and in "lead" pencils.

noun. Short for graphite-reinforced plastic, a composite plastic made with graphite fibers noted for light weight strength and stiffness.

noun. A grey colour.

noun. used as a lubricant and as a moderator in nuclear reactors