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elementary particle

n 1  :  any of the particles of which matter and energy are composed or which mediate the fundamental forces of nature : esp  :  one (as the photon or the electron) whose existence has not been attributed to the combination of other more fundamental entities  2  :  one of the structural units of mitochondrial cristae that are observable by the electron microscope usu. as spheres or stalked spheres and are prob. the seat of fundamental energy-producing reactions .
 
 

 
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