antimere
noun
                                                                                                                            
                                                            an·ti·mere
                    
                                                                                                              
                                                                                                                                  ˈant-i-ˌmi(ə)r 
                                                      
                                                          
            
                                
              
          
                                                      : either of a pair of opposite corresponding symmetrical bodily parts (as the halves of a bilaterally symmetrical animal)                                      
                
                    
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  Merriam-Webster unabridged




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