siliceous or silicious /-ishˈəs/ adjective

Of or containing silica

silicic /-isˈik/ adjective

Relating to, or obtained from, silica (silicic acid a general name for a group of acids, eg orthosilicˈic, H₄SiO₄; metasilicˈic, H₂SiO₃)

silicicolous /-sikˈ/ adjective

(L colere to cultivate, inhabit) growing on siliceous soil

silˈicide /-sīd/ noun

A compound of silicon and another element

silicifˈerous adjective

Containing silica

silicification /si-lis-i-fi-kāˈshən/ noun

silicified /-lisˈ/ adjective

silicˈify transitive verb

1. To render siliceous
2. To impregnate or cement with or replace by silica

To become siliceous

silˈicon /-kon or -kən/ noun

A non-metallic element (symbol Si; atomic no 14), forming grey crystals or brown amorphous powder and having semiconducting properties (formerly called silicium /-lisˈ or -lishˈ/)

silˈicone noun

Any of a number of extremely stable organic derivatives of silicon, used in rubbers, lubricants, polishes, etc

silicosis /-kōˈsis/ noun

A lung disease caused by the prolonged inhalation of silica dust

silicotˈic noun and adjective

silica gel noun

An absorbent form of silica used as a drying agent, and as a catalyst in many chemical processes

silicon carbide noun

A hard, crystalline compound, widely used as an abrasive and in cutting, grinding and polishing instruments

silicon chip see under chip

silicon valley noun

A district or area in which there is a concentration of information technology industries (from the orig Silicon Valley in California)