One of the mysteries of the English language finally explained.
A process by which an image is photographically transferred to a plate for printing in such a way that either the light or the dark areas become susceptible to attack by an etchant; specifically such a process in which the plate is for relief printing, the non-printing areas being etched (contrasted with photogravure).
Mid 19th century; earliest use found in Scientific American. From photo- + engraving.
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