pantile
noun
                                                                                                                            
                                                            pan·tile
                    
                                                                                                              
                                                                                                                                  ˈpan-ˌtī(-ə)l  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : a roofing tile whose cross section is an ogee curve                                      
                
                    
2
                    
                                          
              
          
                                                      : a roofing tile of which the cross section is an arc of a circle and which is laid with alternate convex and concave surfaces uppermost                                      
                
                    
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  Merriam-Webster unabridged




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