Century Dictionary and Cyclopedia
- n. 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.
GNU Webster's 1913
“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.”
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