GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Ironstone (?),
   1. n. A hard, earthy ore of iron.
   
   [1913 Webster]
   
   
   2. ironstone china.
   
   [PJC]
   
   Clay ironstone. See under Clay. -- Ironstone china, a hard white pottery, first made in England during the 18th century.
   
   [1913 Webster]