hypogeum
noun
                                                                                                                            
                                                            hy·po·ge·um
                    
                                                                                                              
                                                                                                                                  ˌhī-pə-ˈjē-əm  
                                                      
                                                          
            
            
               plural hypogea
                                        ˌhī-pə-ˈjē-ə  
    
            
        
    
                                
              
          
                                                      : the subterranean part of an ancient building                                      
                
                                
            also                
          
                                                      : an ancient underground burial chamber                                      
            
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  Merriam-Webster unabridged




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