1.silica gel2.silicone rubber
diatom (single-celled phytoplankton)
1.silicon carbide2.carborundum
1.siliceous2.containing silica
(electronics) silicon-controlled rectifier (SCR); thyristor
polycrystalline silicon (used in electronics)
1.fluorosilicic acid H2SiF62.fluorosilicate
Bacillariophyta, phylum of diatom single-celled phytoplankton
siliceous rock (mostly composed of silica)
sial rock (containing silicon and aluminium, so comparatively light, making continental plates)
silicon tetrafluoride SiF4