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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
sig·ma    Audio Help   [sig-muh] Pronunciation Key
–noun
1.the 18th letter of the Greek alphabet: Σ, σ, ς.
2.the consonant sound represented by this letter.
[Origin: 1600–10; < L < Gk sígma]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
Sigma

To learn more about Sigma visit Britannica.com

© 2008 Encyclopædia Britannica, Inc.
American Heritage Dictionary - Cite This Source - Share This
sig·ma    Audio Help   (sĭg'mə)  Pronunciation Key 
n.  
  1. The 18th letter of the Greek alphabet. See Table at alphabet.
  2. A sigma factor.
  3. A sigma baryon.


[Greek sīgma, of Phoenician origin; see smk in Semitic roots.]

sig'mate' (-māt') adj.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
WordNet - Cite This Source - Share This
sigma

noun
the 18th letter of the Greek alphabet 

WordNet® 3.0, © 2006 by Princeton University.
The American Heritage Science Dictionary - Cite This Source - Share This
sigma    Audio Help   (sĭg'mə)  Pronunciation Key 
A sigma baryon.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

sigma sig·ma (sĭg'mə)
n.

Symbol ς The 18th letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Free On-line Dictionary of Computing - Cite This Source - Share This

SIGMA
A scientific visual programming environment from NASA.
(http://fi-www.arc.nasa.gov/fia/projects/sigma/).

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Sigma

Pleu`ro*sig"ma\, n. [NL. See Pleuro-, and Sigma.] (Bot.) A genus of diatoms of elongated elliptical shape, but having the sides slightly curved in the form of a letter S. Pleurosigma angulatum has very fine striations, and is a favorite object for testing the high powers of microscopes.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
Acronym Finder - Cite This Source - Share This

SIGMA

SIGMA: in Acronym Finder

Acronym Finder, © 1988-2007 Mountain Data Systems
On-line Medical Dictionary - Cite This Source - Share This

sigma

sigma: in CancerWEB's On-line Medical Dictionary

On-line Medical Dictionary, © 1997-98 Academic Medical Publishing & CancerWEB
Browse Nearby Entries:

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