The Collaborative International Dictionary of English v.0.48:

Metallography \Met`al*log"ra*phy\, n. [L. metallum metal +
   -graphy: cf. F. m['e]tallographie.]
   1. The science or art of metals and metal working; also, a
      treatise on metals.
      [1913 Webster]

   2. A method of transferring impressions of the grain of wood
      to metallic surfaces by chemical action. --Knight.
      [1913 Webster]

   3. A substitute for lithography, in which metallic plates are
      used instead of stone. --Knight.
      [1913 Webster]