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
silicic acid in American English
1.
any of several jellylike masses, SiO2·n H2O, precipitated by acidifying sodium silicate solution
2.
any of several hypothetical acids of which the different mineral silicates may be regarded as salts