1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Buhrstone  \Buhr"stone`\,  n.  [OE.  bur  a  whetstone  for  scythes.] 
  (Min.) 
  A  cellular,  flinty  rock,  used  for  mill  stones.  [Written  also 
  {burrstone}.] 

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