alkylating agent
noun
                                
              
          
                                                      : a substance that causes replacement of hydrogen by an alkyl group especially in a biologically important molecule                                      
                
                                
            specifically                
          
                                                      : one with mutagenic activity that inhibits cell division and growth and is used to treat some cancers                                      
            
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  Merriam-Webster unabridged




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