• (n.) A printing process of engraving on a surface of wax spread on a steel plate, for electrotyping.
Ce'ro·type` noun [ Greek ... wax + - type .] A printing process of engraving on a surface of wax spread on a steel plate, for electrotyping. 
a process of engraving in which the design or the like is cut on a wax-coated metal plate from which a printing surface is subsequently produced by stereotyping or by electrotyping.