Si-lĭç'ic, a.

a. [Fr. silicique, from Lat. silex, silicis, a flint.] (Chem.) Of, pertaining to, or obtained from, flint or quartz.

Silicic acid, an acid composed of one equivalent of silicon and three of oxygen. When pure, it is a light, white powder, which feels rough when rubbed between the fingers. It is both inodorous and insipid. It combines with bases, forming salts, which are called silicates. Rock crystal, flint, and other varieties of quartz, are nearly pure silicic acid.