Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of sigma is as below...

Pleurosigma :: Pleurosigma (n.) 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..

Sigma :: Sigma (n.) The Greek letter /, /, or / (English S, or s). It originally had the form of the English C..

Sigmas :: Sigmas (pl. ) of Sigm.

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