n. The art or operation of covering articles with a thin coating or film of metal, especially of overlaying articles made of the baser metals with a thin coating of gold, silver, or nickel.n. A thin coating of one metal laid upon another.n. In bacterial., the pouring of liquefied gelatin or agar-agar containing a mixed culture of bacteria upon a glass plate or into a Petri dish, where the medium hardens and thus permits the isolation of specific organisms. Also plating-out.n. In iron ship-building, the plates, collectively, arranged in strakes covering any part: as, side-plating, the plates forming the outer skin of the vessel above the turn of the bilge; bottom-plating, the plates forming the outer bottom of a vessel below the turn of the bilge; deck-plating, the covering of the deck-beams, etc.