'Polysilicic acid' definitions:

Definition of 'Polysilicic acid'

From: GCIDE

Polysilicic \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. [1913 Webster]
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. [1913 Webster]