Definition of ironstone noun from the Oxford Advanced Learner's Dictionary

 

ironstone

 noun
noun
BrE BrE//ˈaɪənstəʊn//
 
; NAmE NAmE//ˈaɪərnstoʊn//
 
[uncountable]
 
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a type of rock that contains iron
See the Oxford Advanced American Dictionary entry: ironstone