In technical uses. An original disc or (formerly) a cylinder with grooves cut by a stylus during sound recording. Obsolete.

A mould, die, etc. Sound Recording. A copy (positive or negative) of an original disc recording, which is used for making other copies; spec. such…

In technical uses. Originally (also master matrix): a disc with ridges in place of grooves which is used to press gramophone records or to make a…

A disc with grooves that is made from the plating of an electrotyped master matrix and is used to make a stamper for gramophone records, compact…

Sound Recording. A disc similar to a gramophone record but having ridges in place of grooves, from which records are made. Now historical.

An instrument used in stamping. A matrix or copy of an original disc recording used to press other copies of a gramophone record.