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 1913.

Log in or registerto write something here or to contact authors.