semielliptical Syllabification: (sem·i·el·lip·ti·cal)Pronunciation: /ˌsemē-iˈliptikəl, ˌsemˌī-/Definition of semielliptical adjective having the shape of half of an ellipse bisected by one of its diameters, especially the major axis. semielliptical in other Oxford dictionaries Definition of semielliptical in the British & World English dictionary