(historical) A plate prepared by a mechanical process, especially a photomechanical process.

(photography, historical) A photographic process based on the action of light in rendering a thin layer of bitumen, with which the plate is coated, insoluble.

(engineering, mining) A method of sinking through water-bearing ground, in which the shaft is lined with tubbing and provided with an airlock, work being proceeded with under air pressure.

A process of electric welding in which heat is developed by a large current passing through the metal.

The process of treating silver ores by grinding in pans or tubs with the addition of mercury, and sometimes of chemicals such as blue vitriol and salt.

A process of tanning goatskin, calfskin or sheepskin, with a combination of vegetable and mineral agents, so that it resembles kid leather.

A process of desilverizing argentiferous lead by repeated meltings and skimmings, which concentrate the silver in the molten bath, the final skimmings being nearly pure lead.

(manufacturing, medicine) Tomographic imaging of processes, especially industrial.

A cause of action in tort arising from one party making a malicious and deliberate misuse or perversion of regularly issued court process (civil or criminal) not justified by the underlying legal action.

plural of mastoid process