Crossword clues for extrados
The Collaborative International Dictionary
                    Extrados
                    
                        
                
                                                                    Extrados \Ex*tra"dos\, n. [F.; pref. extra- outside + dos (L. dorsum) the back.] (Arch.) The exterior curve of an arch; esp., the upper curved face of the whole body of voussoirs. See Intrados.
Wiktionary
                    extrados
                    
                        
                
                                                                    n. (context architecture English) The outer or upper curve of an arch.
WordNet
                    extrados
                    
                        
                
                                                                    n. the exterior curve of an arch