The Collaborative International Dictionary of English v.0.48:

Stannic \Stan"nic\ (-n[i^]k), a. [L. stannum tin: cf. F.
   stannique.] (Chem.)
   Of or pertaining to tin; derived from or containing tin;
   specifically, designating those compounds in which the
   element has a higher valence as contrasted with stannous
   compounds.
   [1913 Webster]

   Stannic acid.
   (a) A hypothetical substance, Sn(OH)4, analogous to silicic
       acid, and called also normal stannic acid.
   (b) Metastannic acid.

   Stannic chloride, a thin, colorless, fuming liquid,
      SnCl4, used as a mordant in calico printing and dyeing;
      -- formerly called spirit of tin, or fuming liquor of
      Libavius.

   Stannic oxide, tin oxide, SnO2, produced artificially as
      a white amorphous powder, and occurring naturally in the
      mineral cassiterite. It is used in the manufacture of
      white enamels, and, under the name of putty powder, for
      polishing glass, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stannic
    adj 1: of or relating to or containing tin [syn: stannic,
           stannous]