silicon:  Silicon was coined in 1817 by the British chemist Thomas Thomson. Like the slightly earlier silica, it was based on Latin silex ‘flint’. From the same source comes silicone, which dates from the 1860s.
nonmetallic element, 1817, coined by British chemist Thomas Thomson from silica (silicon dioxide), from which it was isolated. The name is patterned on carbon, etc. Silicon chip first attested 1965; Silicon Valley for the Santa Clara Valley south of San Francisco, U.S., first attested 1974, from the concentration of manufacturers of silicon chips used in computers, watches, etc.