silicon

 
Pronunciation: /ˈsɪlɪk(ə)n/

noun

[mass noun]
  • the chemical element of atomic number 14, a non-metal with semiconducting properties, used in making electronic circuits. Pure silicon exists in a shiny dark grey crystalline form and as an amorphous powder. (Symbol: Si)

Origin:

early 19th century: alteration of earlier silicium, from Latin silex, silic- 'flint', on the pattern of carbon and boron

Do not confuse silicon with silicone. Silicon is a chemical element used in electronic circuits and microchips, whereas silicone is the material used in cosmetic implants.