An electron microscope is a type of very powerful microscope that uses electrons instead of light to produce a magnified image of something.
...specimens that can only be observed under a powerful electron microscope.
electron microscope in British English
noun
a powerful type of microscope that uses electrons, rather than light, and electron lenses to produce a magnified image
electron microscope in American English
an instrument that focuses a beam of electrons on an object, using electric or magnetic fields, to form an enlarged image of the object on a fluorescent screen, photographic plate, or cathode-ray tube; specif., such an instrument in which the beam of electrons passes directly through an extremely thin object and forms a two-dimensional image: it is much more powerful than any optical microscope
see also scanning electron microscope
Examples of 'electron microscope' in a sentence
electron microscope
He said that he did not understand why they had not examined them more rigorously, for instance under an electron microscope.
Times, Sunday Times (2016)
It seems unlikely its present owner will be putting it under an electron microscope.
Times, Sunday Times (2008)
The first was the electron microscope.
The Times Literary Supplement (2014)
A scanning electron microscope can see both clearly.
Times, Sunday Times (2010)
Not least, these germs have a habit of looking beautiful and haunting when seen under an electron microscope.
Times, Sunday Times (2008)
A range of clues like these can be identified very easily by looking at the shape of crystals in a scanning electron microscope.
Michael Boulter EXTINCTION: Evolution and the End of Man (2002)
But they are, in fact, images of the human body taken with a powerful electron microscope.