The Collaborative International Dictionary
Polysilicic
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.
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.
Wiktionary
polysilicic
a. (context obsolete chemistry English) Of or pertaining to any polymer of silicic acid