PLEUROSIGMA
Pleu`ro*sig"ma, n. Etym: [NL. See Pleuro-, and Sigma.] (Bot.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition
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18 March 2025
ODONTOGLOSSUM
(noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors
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