[ uhl-truh-mahy-kruh-skohp ]
/ ˌʌl trəˈmaɪ krəˌskoʊp /


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

Nearby words

  1. ultrametamorphism,
  2. ultramicrobalance,
  3. ultramicrochemistry,
  4. ultramicrofiche,
  5. ultramicrometer,
  6. ultramicroscopic,
  7. ultramicroscopy,
  8. ultramicrotome,
  9. ultraminiature,
  10. ultraminiaturize

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

  • 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


/ (ˌʌltrəˌmaɪkrəˈskɒpɪk) /


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


/ (ˌʌltrəˈmaɪkrəˌskəʊp) /


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

Medicine definitions for ultramicroscopic


[ ŭl′trə-mī′krə-skŏpĭk ]


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


[ ŭl′trə-mīkrə-skōp′ ]


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.