silico

a. (Chem.) Containing, or composed of, silicon and fluorine; especially, denoting the compounds called silicofluorides. [ 1913 Webster ]

Silicofluoric acid (Chem.), a compound of hydrofluoric acid and silicon fluoride, known only in watery solution. It is produced by the action of silicon fluoride on water, and is regarded as an acid, H2SiF6, and the type and origin of the silicofluorides. [ 1913 Webster ]

n. (Chem.) A fluosilicate; a salt of silicofluoric acid. [ 1913 Webster ]

‖n. pl. [ NL. See Silex, and -oid. ] (Zool.) An extensive order of Porifera, which includes those that have the skeleton composed mainly of siliceous fibers or spicules. [ 1913 Webster ]

n. [ See Silica. ] (Chem.) A nonmetalic element analogous to carbon. It always occurs combined in nature, and is artificially obtained in the free state, usually as a dark brown amorphous powder, or as a dark crystalline substance with a meetallic luster. Its oxide is silica, or common quartz, and in this form, or as silicates, it is, next to oxygen, the most abundant element of the earth's crust. Silicon is characteristically the element of the mineral kingdom, as carbon is of the organic world. Symbol Si. Atomic weight 28. Called also silicium. [ 1913 Webster ]