Bible Dictionaries
Pleurosigma
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Pleurosigma'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/pleurosigma.html. 1828.