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ironMain Entry: 1iron Pronunciation: \ˈī(-ə)rn\ Function: noun Etymology: Middle English, from Old English īsern, īren; akin to Old High German īsarn iron Date: before 12th century 1 : a silver-white malleable ductile magnetic heavy metallic element that readily rusts in moist air, occurs native in meteorites and combined in most igneous rocks, is the most used of metals, and is vital to biological processes — see element table — iron in the fire 1 : a matter requiring close attention
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