1. 
   Thornbut
   Thorn'but noun [ Thorn + -but as in halibut ; confer German dornbutt .] (Zoology) The turbot.
   Found op http://www.encyclo.co.uk/webster/T/47
   
   
2. 
   thornbut
   <zoology> The turbot. ... Origin: Thorn + -but as in halibut; cf. G. Dornbutt. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?thornbut
   
   
3. 
   Thornbut
   • (n.) The turbot.
   Found op http://thinkexist.com/dictionary/meaning/thornbut/
   
   

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