diacaustic /ˌdaɪəˈkɔːstɪk, -ˈkɒs-/

→ compare catacaustic

• 1. 

  ADJ (of a caustic curve or surface) formed by refracted light rays (焦散曲线或面)折射散焦的

• 2. 

  N a diacaustic curve or surface 折射散焦线或面