ultramicroscopic

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ultramicroscopic

 [ul″trah-mi″kro-skop´ik]
too small to be seen with the ordinary light microscope.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

sub·mi·cro·scop·ic

(sŭb'mī-krō-skop'ik),
Too minute to be visible with a light microscope.
Farlex Partner Medical Dictionary © Farlex 2012

ultramicroscopic

(ŭl′trə-mī′krə-skŏp′ĭk)
adj.
1. Too minute to be seen with an ordinary microscope.
2. Of or relating to an ultramicroscope.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

sub·mi·cro·scop·ic

(sŭb'mī-krŏ-skop'ik)
Too minute to be visible with a light microscope.
Synonym(s): ultramicroscopic.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ultramicroscopic

Too small to be resolved by an ordinary optical microscope but visible when illuminated by light from the side agaist a dark background.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005