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.

---

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

---

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

---

silicon Cultural  

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

---

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

SK Group chair Chey Tae-won last week vowed to double production capacity of silicon wafers used to make memory chips.

From Barron's • Jun. 8, 2026

“Wall Street demands the deployment of raised capital to build structural moats, giving semiconductor and custom silicon suppliers the most transparent, legally insulated 12-month demand backlogs the industry has ever seen,” he said.

From Barron's • Jun. 2, 2026

The proliferation of tens of millions of AI agents—or autonomous bots that are capable of doing many tasks—has changed how companies like Nvidia design and market their silicon products and other tools.

From The Wall Street Journal • Jun. 1, 2026

Producing high-quality crystalline silicon and fabricating high-performance semiconductor devices typically requires temperatures approaching 1,000 degrees Celsius.

From Science Daily • May 30, 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