electron
noun
                                                                                                                            
                                                            elec·tron
                    
                                                                                                              
                                                                                                                                  i-ˈlek-ˌträn  
                                                      
                                                          
            
                                
              
          
                                                      : an elementary particle consisting of a charge of negative electricity equal to about 1.602 × 10−19 coulomb and having a mass when at rest of about 9.109 × 10−31 kilogram or about ¹/₁₈₃₆ that of a proton                                      
                
                    
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  Merriam-Webster unabridged




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