Plat"ing (?), n.
1.
The art or process of covering anything with a plate or plates, or with metal, particularly of overlaying a base or dull metal with a thin plate of precious or bright metal, as by mechanical means or by electro-magnetic deposition.
2.
A thin coating of metal laid upon another metal.
3.
A coating or defensive armor of metal (usually steel) plates.
© Webster 1913.