Chapter Signet to Silicispongiæ of S by Webster's Dictionary (1913 Edition)

Silicic
(Si*lic"ic) a. [L. silex, silicis, a flint: cf. F. silicique.] (Chem.) 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.

Silicicalcareous
(Si*lic`i*cal*ca"re*ous) a. Consisting of silica and calcareous matter.

Silicide
(Sil"i*cide) n. (Chem.) 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.

Siliciferous
(Sil`i*cif"er*ous) a. [L. silex, silicis, a flint + -ferous.] Producing silica; united with silica.

Silicification
(Si*lic`i*fi*ca"tion) n. [See Silicify.] (Chem.) 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.

Silicified
(Si*lic"i*fied) a. (Chem.) Combined or impregnated with silicon or silica, especially the latter; as, silicified wood.

Silicify
(Si*lic"i*fy) v. t. [imp. & p. p. Silicified ; p. pr. & vb. n. Silicifying ] [L. silex, silicis, a flint + -fy: cf. F. silicifier.] (Chem.) To convert into, or to impregnate with, silica, or with the compounds of silicon.

The specimens found . . . are completely silicified.

Say.

The silica may take the form of agate, chalcedony, flint, hornstone, or crystalline quartz.

Silicify
(Si*lic"i*fy), v. i. To become converted into silica, or to be impregnated with silica.

Silicioidea
(||Sil`i*ci*oi"de*a) n. pl. (Zoöl.) Same as Silicoidea.

Silicious
(Si*li"cious) a. See Siliceous.

Silicispongiæ
(||Sil`i*ci*spon"gi*æ) n. pl. [NL. See Silex, and Sponge.] (Zoöl.) Same as Silicoidea.