a technique of engraving, esp. on copper, in which a sharp-pointed needle is used for producing furrows having a burr that is often retained in order to produce a print characterized by soft, velvety black lines.
A technique of intaglio engraving in which a hard steel needle is used to incise lines in a metal, usually copper plate, with the rough burr at the sides of the incised lines often retained to produce a velvety black tone in the print.