silicon

American  

[sil-i-kuhn, -kon] / ˈsɪl ɪ kən, -ˌkɒn /

noun

Chemistry.

1. a nonmetallic element, having amorphous and crystalline forms, occurring in a combined state in minerals and rocks and constituting more than one fourth of the earth's crust: used in steelmaking, alloys, etc. Si; 28.086; 14; 2.4 at 20°C.

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silicon British  

/ ˈsɪlɪkən /

noun

1. 1. a brittle metalloid element that exists in two allotropic forms; occurs principally in sand, quartz, granite, feldspar, and clay. It is usually a grey crystalline solid but is also found as a brown amorphous powder. It is used in transistors, rectifiers, solar cells, and alloys. Its compounds are widely used in glass manufacture, the building industry, and in the form of silicones. Symbol: Si; atomic no: 14; atomic wt: 28.0855; valency: 4; relative density: 2.33; melting pt: 1414°C; boiling pt: 3267°C

   2. (modifier; sometimes capital) denoting an area of a country that contains a density of high-technology industry

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silicon Scientific  

/ sĭl′ĭ-kŏn′ /

1. A metalloid element that occurs in both gray crystalline and brown noncrystalline forms. It is the second most abundant element in the Earth's crust and can be found only in silica and silicates. Silicon is used in glass, semiconductors, concrete, and ceramics. Atomic number 14; atomic weight 28.086; melting point 1,410°C; boiling point 2,355°C; specific gravity 2.33; valence 4.

2. See Periodic Table

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silicon Cultural  

1. A chemical element from which semiconductors are made. It is also used in the manufacture of glass, concrete, brick, and pottery.

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Etymology

Origin of silicon

1817; silic(a) + -on, as in carbon and boron

Compare meaning

How does silicon compare to similar and commonly confused words? Explore the most common comparisons:

• silica vs. silicon

Example Sentences

See Examples For:

silicon

Talc is a natural mineral made of magnesium, silicon, oxygen and hydrogen, known for its soapy feel and is often used in baby powder.

From BBC ● Jul. 28, 2026

The company is attempting to bundle hundreds of thousands of AI chips into massive clusters that function as a single computer to mimic cutting-edge silicon.

From The Wall Street Journal ● Jul. 24, 2026

The cutting-edge 3-nanometer process can fit 250 million to 300 million transistors in one square millimeter of silicon.

From The Wall Street Journal ● Jul. 24, 2026

Optical fibers collect the photons produced in each section and carry the light to photomultiplier tubes or silicon photomultipliers, which count the photons.

From Science Daily ● Jul. 17, 2026

“But I guess Aluminum Man isn’t appropriate either, since he’s also made of titanium, steel, plastic, various polymers, and silicon computer chips.”

From "Ungifted" by Gordon Korman