Source : Webster's Revised Unabridged Dictionary (1913)

Titanic \Ti*tan"ic\, a.
   Of or relating to Titans, or fabled giants of ancient
   mythology; hence, enormous in size or strength; as, Titanic
   structures.

Titanic \Ti*tan"ic\, 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.

   {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}.

Source : WordNet®

titanic
     adj : of great force or power