cyclodiene
noun
                                                                                                                            
                                                            cy·clo·di·ene
                    
                                                                                                              
                                                                                                                                  ˌsī-klō-ˈdī-ˌēn 
                                                                                                                              
            -dī-ˈēn
                                                      
                                                          
                                
              
          
                                                      : an organic insecticide (such as dieldrin or chlordane) with a chlorinated methylene group forming a bridge across a 6-membered carbon ring                                      
                
                    
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  Merriam-Webster unabridged




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