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

Origin of ultramicroscope

First recorded in 1905–10; ultra- + microscope
Related formsul·tra·mi·cro·scop·ic [uhl-truh-mahy-kruh-skop-ik] /ˌʌl trəˌmaɪ krəˈskɒp ɪk/, ul·tra·mi·cro·scop·i·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ultramicroscopic

Historical Examples of ultramicroscopic

  • The term virus or filterable virus is likewise applied to these ultramicroscopic and filterable agents.

    The Fundamentals of Bacteriology

    Charles Bradfield Morrey

  • In this way as well as by the inoculation of animals the presence of the ultramicroscopic kinds may be demonstrated.

    Insects and Diseases

    Rennie W. Doane

British Dictionary definitions for ultramicroscopic



too small to be seen with an optical microscope
of or relating to an ultramicroscope
Derived Formsultramicroscopy (ˌʌltrəmaɪˈkrɒskəpɪ), noun



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 backgroundAlso called: dark-field microscope
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

ultramicroscopic in Medicine




Too minute to be seen with an ordinary microscope.
Of or relating to an ultramicroscope.




A microscope with high-intensity illumination used to study very minute objects.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.