undercroft
noun
                                                                                                                            
                                                            un·der·croft
                    
                                                                                                              
                                                                                                                                  ˈən-dər-ˌkrȯft  
                                                      
                                                          
            
                                
              
          
                                                      : a subterranean room                                      
                
                                
            especially                
          
                                                      : a vaulted chamber under a church                                      
            
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  Merriam-Webster unabridged




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