electron microscope

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of a class of microscopes that use electrons rather than visible light to produce magnified images, especially of objects having dimensions smaller than the wavelengths of visible light, with linear magnification approaching or exceeding a million (10⁶).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several forms of microscope that use a beam of electrons rather than one of light and thus has a much greater resolving power

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light