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Bible Dictionaries
Pleurosigma

Webster's Dictionary

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(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.

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