Definitions

from the GNU version of the Collaborative International Dictionary of English

  • 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.

from The Century Dictionary and Cyclopedia

  • n. A genus of Diatomace√¶, containing species in which the valves show, with a good microscope, a series of lines, capable, under high powers and a favorable light, of resolution into dots, and therefore furnishing excellent tests for the power of a microscope.

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