clean room
noun
                                                                                                                            
                    
                                                                                                              
                                                                                                                                  ˈklēn-ˌrüm  
                                                                                                                              
            -ˌru̇m
                                                      
                                                          
                                
              
          
                                                      : a room for the manufacture or assembly of objects (such as precision parts) that is maintained at a high level of cleanliness by special means                                      
                
                    
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  Merriam-Webster unabridged




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