The Collaborative International Dictionary of English v.0.48:

titanic \ti*tan"ic\ (t[-i]*t[a^]n"[i^]k), a. [Cf. F. titanique.]
   (Chem.)
   Of or pertaining to titanium; derived from, or containing,
   titanium; specifically, designating those compounds of
   titanium in which it has a higher valence as contrasted with
   the titanous compounds.
   [1913 Webster]

   titanic acid (Chem.), a white amorphous powder, Ti(OH)4,
      obtained by decomposing certain titanates; -- called also
      normal titanic acid. By extension, any one of a series
      of derived acids, called also metatitanic acid,
      polytitanic acid, etc.

   Titanic iron ore. (Min.) See Menaccanite.
      [1913 Webster]

WordNet (r) 3.0 (2006):

titanic acid
    n 1: a white weak acid that is a hydrated form of titanium
         dioxide