catacaustic /ˌkætəˈkɔːstɪk, -ˈkɒs-/

• 1. 

  ADJ (of a caustic curve or surface) formed by reflected light rays (焦散曲面或表面)回光线形成的 → compare diacaustic

• 2. 

  N a catacaustic curve or surface 回光曲面; 回光表面