A microscopy technique that uses a beam of electrons instead of light to create images, achieving much higher resolution and magnification than light microscopy. It can reveal ultrastructural details of cells and materials at the nanometer scale.
Formed from 'electron' (discovered by J.J. Thomson in 1897) and 'microscopy' from Greek 'mikros' (small) and 'skopein' (to look). Developed by Ernst Ruska in the 1930s, exploiting the wave properties of electrons for unprecedented magnification.
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