Definition
A nonmetallic chemical element (symbol Si) that is the second most abundant element in the Earth's crust. In aviation, silicon is used as the base material for semiconductors in electronic components, as an alloying element in aluminum and steel, and as the basis for silicone compounds used in sealants, lubricants, and high-temperature gaskets.
Plain English
A natural element found in sand and rock that engineers use to make computer chips, electronic parts, and rubber-like sealants that can handle heat and weather.
Context Anchor
Seen in discussions of aircraft electrical systems, avionics, diodes, transistors, and other electronic components.
Derivation
From the Latin silex, meaning flint or hard stone. The name reflects that silicon is the main ingredient in sand, quartz, and most rocks, which helps explain why it shows up so often in industrial materials.
Why Pilots Care
Modern flight instruments and navigation computers depend on silicon semiconductors for reliable operation.
Intuition Check
Silicon is not the same as silicone. Silicon is an element used in electronics; silicone is a rubber-like material used in sealants, hoses, and similar products.
Example Sentence 1
The avionics in the cockpit rely on silicon chips to process navigation and communication signals.
Example Sentence 2
Technicians spread silicon sealant around the cabin windows during the annual inspection.