1) Engraving 
Process of etching unprotected parts of a zinc plate with strong acids to produce a printing surface.
Zincography was a planographic printing process that used zinc plates. Alois Senefelder first mentioned zinc`s lithographic use as a substitute for Bavarian limestone in his 1801 English patent specifications. In 1834,Federico Lacelli patented a zincographic printing process, producing large maps called géoramas. In 1842, Kaeppelin perfected the....
process of engraving or etching on zinc
• (n.) The art or process of engraving or etching on zinc, in which the design is left in relief in the style of a wood cut, the rest of the ground being eaten away by acid.
Zin·cog'ra·phy noun [ Zinco- + -graphy .] The art or process of engraving or etching on zinc, in which the design is left in relief in the style of a wood cut, the rest of the ground being eaten away by acid. 
Process of etching unprotected parts of a zinc plate with strong acids to produce a printing surface. See also: Zinc.
the art or process of producing a printing surface on a zinc plate, esp. of producing one in relief by etching away unprotected parts with acid.