1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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}). 

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