lignosulfonate
noun
                                                                                                                            
                                                            lig·no·sul·fo·nate
                    
                                                                                                              
                                                                                                                                  ˌlig-nō-ˈsəl-fə-ˌnāt  
                                                      
                                                          
            
                                
              
          
                                                      : any of various compounds produced from the spent sulfite liquor in the pulping of softwood in papermaking and used especially for binders and dispersing agents                                      
                
                    
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  Merriam-Webster unabridged




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