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electrosurgery
electrotherapy
electrothermal
electrotropism
electrotype
electrovalence
electrovalent bond
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elementary particle
el·e·men·ta·ry par·ti·cle (plural el·e·men·ta·ry par·ti·cles)


noun 
Definition:
 
basic indivisible constituent of matter: any one of the subatomic constituents of which matter and energy are composed, e.g. electrons, leptons, photons, or hadrons
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