Si

Si ¹

The symbol for the element silicon.

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Si ²

abbr. Bible

Wisdom of Jesus, the Son of Sirach

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si  (s)

n. Music

Ti.

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[Italian, from Medieval Latin; see gamut.]

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si

Noun

Music same as te

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Si Chem silicon

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SI See SI unit

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Si

The symbol for silicon.

Thesaurus

Noun	1.	Si - a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors atomic number 14, silicon chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities clay - a very fine-grained soil that is plastic when moist but hard when fired semiconducting material, semiconductor - a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium granite - plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz sand - a loose material consisting of grains of rock or coral silicone, silicone polymer - any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation
	2.	SI - a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites" International System, International System of Units, SI system, SI unit, Systeme International, Systeme International d'Unites metric system - a decimal system of weights and measures based on the meter and the kilogram and the second
	3.	si - the syllable naming the seventh (subtonic) note of any musical scale in solmization te, ti solfa syllable - one of the names for notes of a musical scale in solmization