urostyle
noun
                                                                                                                            
                                                            uro·style
                    
                                                                                                              
                                                                                                                                  ˈyu̇r-ə-ˌstī(-ə)l  
                                                      
                                                          
            
                                
              
          
                                                      : a long unsegmented bone that represents a number of fused vertebrae and forms the posterior part of the vertebral column of frogs and toads                                      
                
                    
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