The Collaborative International Dictionary of English v.0.48:

Silicic \Si*lic"ic\, a. [L. silex, silicis, a flint: cf. F.
   silicique.] (Chem.)
   Pertaining to, derived from, or resembling, silica;
   specifically, designating compounds of silicon; as, silicic
   acid.
   [1913 Webster]

   Silicic acid (Chem.), an amorphous gelatinous substance,
      Si(HO)4, very unstable and easily dried to silica, but
      forming many stable salts; -- called also orthosilicic
      acid or normal silicic acid.
      [1913 Webster]