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SI

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si

[see]
–noun Music.
the syllable used for the seventh tone of a scale and sometimes for the tone B.

Origin:
1720–30; see gamut

Si

Symbol, Chemistry.
silicon.

S.I.

1. Sandwich Islands.
2. Staten Island.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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si   (sē)   
n.   Music
Ti.

[Italian, from Medieval Latin; see gamut.]
Si 1  
The symbol for the element silicon.
Si 2  
abbr.   Bible
Wisdom of Jesus, the Son of Sirach
SI  
abbr.   French
Système International [d'Unités] (International System [of Units])
sil·i·con   (sĭl'ĭ-kən, -kŏn')   
n.   Symbol Si
A nonmetallic element occurring extensively in the earth's crust in silica and silicates, having both an amorphous and a crystalline allotrope, and used doped or in combination with other materials in glass, semiconducting devices, concrete, brick, refractories, pottery, and silicones. Atomic number 14; atomic weight 28.086; melting point 1,410°C; boiling point 2,355°C; specific gravity 2.33; valence 4. See Table at element.

[From silica.]
Wisdom of Jesus, the Son of Si·rach   (sī'rāk')
n.   Bible Abbr. Sir. or Si
Ecclesiasticus
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

si 
"yes" in It., Sp., Port.; from L. sic "so" (see sic).
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: Si
Function: symbol
silicon

Main Entry: SI
Function: abbreviation
Etymology: French Système International d'Unités
International System of Units
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

Si
The symbol for the element silicon.

SI abbr.
Système International (d'Unités) (International System of Units)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

SI
1. Système International.
2. Shift In.

si networking
The country code for Slovenia.
(1999-01-27)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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Abbreviations & Acronyms
si
Sinhalese
sI
6-mercaptopurine ribonucleoside
Si
  1. silicon

  2. Wisdom of Jesus, the Son of Sirach

SI
  1. sacroiliac joint

  2. secondary infertility

  3. Smithsonian Institution

  4. French Système International [d'Unités] (International System [of Units])

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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