Definitions

from The Century Dictionary.

  • noun A genus of Diatomaceæ, 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.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.

Etymologies

Sorry, no etymologies found.

Examples

  • The figure I here show you a was photographed from an object (pleurosigma angulatum) magnified a thousand diameters, or presenting a million times its natural surface.

    Complete Project Gutenberg Oliver Wendell Holmes, Sr. Works

  • The figure I here show you a was photographed from an object (pleurosigma angulatum) magnified a thousand diameters, or presenting a million times its natural surface.

    Medical Essays, 1842-1882

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