scorpionfly Syllabification: (scor·pi·on·fly)Pronunciation: /ˈskôrpēənˌflī/ (also scorpion fly)Definition of scorpionfly noun (plural scorpionflies) a slender predatory insect with membranous wings, long legs, and a downward-pointing beak. The terminal swollen section of the male’s abdomen is carried curved up like a scorpion’s stinger. Order Mecoptera: several families, in particular Panorpidae