Thornback

·noun The large European spider crab or king crab (Maia squinado).

II. Thornback ·noun A European skate (Raia clavata) having thornlike spines on its back.

thornback
An old maid. ...

Dictionary of The Vulgar Tongue by Francis Grose
thornback
n. special name for one of theStingrays, Raia lemprieri, Richards., or Rajarostata, Castln., family...

Dictionary of Australasian Words Phrases and Usages by Edward E. Morris