pereon
noun
                                                                                                                            
                                                            pe·re·on
                    
                                                                                                              
                                                                                                                                  pə-ˈrē-ˌän  
                                                      
                                                          
            
            variants  
 or pereion    
        
    
                                
              
          
                                                      : the thorax or the seven metameres comprising the thorax of some crustaceans (such as a decapod)                                      
                
                    
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  Merriam-Webster unabridged




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