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CIDE DICTIONARY

pleurosigma

CIDE DICTIONARY

pleurosigman. [NL. See Pleuro-, and Sigma.].
     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.  [1913 Webster]

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