(geology) A slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained.

plural of slate blue

plural of slate gray

A mineral used for polishing glass, marble, and metals, composed chiefly of silica, with a little alumina, lime, iron oxide, and water.

An argillaceous rock that splits readily into thin sheets.

(nautical) A double slate, marked and ruled on the inside, for recording the log.

plural of slate pencil

A pencil designed to be used on a writing slate. / (Australia) A hard, grey coloured, aniseed flavoured, sugar-based confectionery in the shape of a rod or stick.

A children's drawing toy with a sheet of plastic film laid over waxed paper, allowing pictures to be "drawn" by the pressure of a stylus and then wiped clean by lifting and replacing the sheet.

A traditional roofing material found in central England, a form of limestone (not true slate).