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Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic.

To represent by a silhouette; to project upon a background, so as to be like a silhouette. [Recent] A flock of roasting vultures silhouetted on the sky. The Century.

Silicon dioxide, SiO

A salt of silicic acid.

Combined or impregnated with silicon or silica; as, silicated hydrogen; silicated rocks. Silicated soap, a hard soap containing silicate of soda.

Silicification.

Same as Silicoidea.

Of or pertaining to silica; containing silica, or partaking of its nature. [Written also silisious.]

Pertaining to, derived from, or resembling, silica; specifically, designating compounds of silicon; as, silicic acid. Silicic acid (Chem.), an amorphous gelatinous substance, Si(HO)4, very unstable and easily dried to silica, but forming many stable salts; -- called also orthosilicic, or normal silicic, acid.…

Consisting of silica and calcareous matter.

A binary compound of silicon, or one regarded as binary. [R.] Hydrogen silicide (Chem.), a colorless, spontaneously inflammable gas, SiH4, produced artifically from silicon, and analogous to methane; -- called also silico-methane, silicon hydride, and formerly siliciureted hydrogen.

Producing silica; united with silica.

Thae act or process of combining or impregnating with silicon or silica; the state of being so combined or impregnated; as, the silicification of wood.

Combined or impregnated with silicon or silica, especially the latter; as, silicified wood.

To convert into, or to impregnate with, silica, or with the compounds of silicon. The specimens found . . . are completely silicified. Say.

Same as Silicoidea.

See Siliceous.

Same as Silicoidea.

Silicified. [Obs.]

See Silicon.