\Pol`y*si*lic"ic\, a. [Poly- + silicic.] (Chem.)
Of or pertaining to compounds formed by the condensation of
two or more molecules of silicic acid.
{Polysilicic acid} (Chem.), any one of a series of acids
   formed by the condensation of two or more molecules of
   silicic acid, with elimination of water.