an instrument that uses scattering phenomena to detect the position of objects too small to be seen by an ordinary microscope.

1905–10; ultra- + microscope

ultramicroscopic [uhl-truh-mahy-kruh-skop-ik] , ultramicroscopical, adjective
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World English Dictionary
ultramicroscope (ˌʌltrəˈmaɪkrəˌskəʊp)
Also called: dark-field microscope a microscope used for studying colloids, in which the sample is strongly illuminated from the side and colloidal particles are seen as bright points on a dark background

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ultramicroscope ul·tra·mi·cro·scope (ŭl'trə-mī'krə-skōp')
A microscope with high-intensity illumination used to study very minute objects.

The American Heritage® Stedman's Medical Dictionary
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