资料来源 : Webster's Revised Unabridged Dictionary (1913)

Thornback \Thorn"back`\, n.
   1. (Zo["o]l.) A European skate ({Raia clavata}) having
      thornlike spines on its back.

   2. (Zo["o]l.) The large European spider crab or king crab
      ({Maia squinado}).