DuckCorp Dico

Found one definition

1.                 From Japanese-German FreeDict Dictionary ver. 0.2.0:
                   
   
   
                   
                     
   凸形 /(en)tʃˈaɪniːz(ja)lˈe̞tə (en)tʃˈaɪniːz(ja)lˈe̞tə/, とつけい /tˌo̞tsɯᵝkˈe̞i/
   (nouns which may take the genitive case particle `no')
    (noun (common) (futsuumeishi))
   凹形konvexe (f) Form, (f) Konvexität