silicic acid(redirected from Orthosilicic acid)
Also found in: Thesaurus, Medical, Encyclopedia.
Hydrated silica, SiO2·nH2O, produced by acidification of sodium silicate solution. Depending on the proportion of water, it may have any consistency from jelly to amorphous solid.
(Elements & Compounds) a white gelatinous substance obtained by adding an acid to a solution of sodium silicate. It has an ill-defined composition and is best regarded as hydrated silica, SiO2.nH2O