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. Symbol: Si; atomic weight: 28.086; atomic number: 14; specific gravity: 2.4 at 20°C.
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
(modifier; sometimes capital) denoting an area of a country that contains a density of high-technology industry
silicon sil·i·con (sĭl’ĭ-kən, -kŏn’)
A nonmetallic element occurring extensively in the earth’s crust in silica and silicates, having both an amorphous and a crystalline allotrope and used in glass and semiconducting devices. Atomic number 14; atomic weight 28.086; melting point 1,414°C; boiling point 3,265°C; specific gravity 2.33; valence 4.
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. See Periodic Table.
silicon [(sil-i-kon, sil-i-kuhn)]
A chemical element from which semiconductors are made. It is also used in the manufacture of glass, concrete, brick, and pottery.
1. The material used as the base (or “substrate”) for most integrated circuits.
2. Hardware, especially integrated circuits or microprocessor-based computer systems (compare iron).
Contrast: software. See also sandbender.
noun, Botany. 1. a short silique. noun 1. (botany) a variant of silicula
noun, (formerly) 1. silicon. noun 1. a rare name for silicon
adjective 1. containing, consisting of, or resembling silica. 2. growing in soil rich in silica. adjective 1. of, relating to, or containing abundant silica: siliceous deposits, a siliceous clay 2. (of plants) growing in or needing soil rich in silica siliceous (sĭ-lĭsh’əs) Resembling or containing silica.
noun 1. Classical Mythology. the second of the four ages of humankind, inferior to the golden age but superior to the bronze age that followed: characterized by an increase of impiety and of human weakness. 2. (usually initial capital letters) a period in Latin literature, a.d. c14–138, following the Augustan Age: the second phase of […]