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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Ironstone  \I"ron*stone`\,  n. 
  A  hard,  earthy  ore  of  iron. 
  {Clay  ironstone}.  See  under  {Clay}. 
  {Ironstone  china},  a  hard  white  pottery,  first  made  in 
  England  during  the  18th  century.