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

In September, Tan overhauled Intel’s reporting structure and established a new Central Engineering Group, hiring Srinivasan Iyengar, the top silicon engineer at Cadence, to consolidate custom chip design efforts under one team.

From The Wall Street Journal • Jul. 11, 2026

In a new study published in Nature Electronics, a Harvard led research team unveiled a silicon chip capable of synthesizing 64 different DNA sequences at the same time.

From Science Daily • Jul. 9, 2026

A guest uses a silicon brush to apply sauces onto an entree, a nod to abstractionist Jackson Pollock.

From Los Angeles Times • Jul. 8, 2026

Qualcomm acquired Alphawave Semi, which brought in high-speed data center connectivity chips and a custom silicon design lab.

From Barron's • Jun. 28, 2026

His mother, a hippie by orientation, worked as a legal secretary; his stepfather was a physicist and engineer who designed machines that made silicon wafers, which computer microprocessors are built on.

From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel