sigma
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σ
, Σ1. The 18th letter of the Greek alphabet, sigma.
2. (σ) Symbol for reflection coefficient; standard deviation; a factor in prokaryotic RNA initiation; wavenumber; surface tension.
3. (Σ) Summation of a series.
sig·ma
(sig'mă),The 18th letter of the Greek alphabet, σ.
Farlex Partner Medical Dictionary © Farlex 2012
sigma
(sĭg′mə)n.
A sigma factor.
sig′mate′ (-māt′) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
σ
Abbreviation for standard deviation; reflection coefficient.
sig·ma
(σ,Σ) (sig'mă)1. The 18th letter of the Greek alphabet.
2. (σ) reflection coefficient;standard deviation; a factor in prokaryotic RNA initiation; surface tension
3. (Σ) Summation of a series.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
sig·ma
(sig'mă)1. The 18th letter of the Greek alphabet (σ, Σ).
2. (σ) reflection coefficient; standard deviation; a factor in prokaryotic RNA initiation; surface tension
3. (Σ) Summation of a series.
Medical Dictionary for the Dental Professions © Farlex 2012