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English definition of “iron”

iron

adjective [not gradable] (MADE OF METAL)   /ˈɑɪ·ərn/
made of or containing iron: iron ore an iron railing along the steps fig. Her success depended on physical strength and an iron will (= strong determination).
(Definition of iron adjective (MADE OF METAL) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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