premold
verb
                                                                                                                            
                                                            pre·mold
                    
                                                                                                              
                                                                                                                                  ˌprē-ˈmōld 
                                                      
                                                          
            
            variants  
 or pre-mold
        
    
            
              premolded or pre-molded; premolding or pre-molding            
        
    
                                
              
          
                                                      : to mold (something) in advance : to give shape to (something) before using or fitting                                      
              
                             
premold a part
                         
                
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  Merriam-Webster unabridged




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