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(uncountable) A common, inexpensive metal, silvery grey when untarnished, that rusts, is attracted by magnets, and is used in making steel: a chemical element having atomic number 26 and symbol Fe.
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(uncountable, countable, metallurgy) Any material, not a steel, predominantly made of elemental iron.
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(countable) A tool or appliance made of metal, which is heated and then used to transfer heat to something else; most often a thick piece of metal fitted with a handle and having a flat, roughly triangular bottom, which is heated and used to press wrinkles from clothing, and now usually containing an electrical heating apparatus.
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Any of several other tools traditionally made of wrought iron, now usually of steel.
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(usually in the plural, irons) Shackles.
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(slang) A firearm, either a long gun or a handgun.
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(uncountable) A dark shade of the color silver.
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(countable, Cockney rhyming slang, offensive, shortened from iron hoof, rhyming with poof) A male homosexual.
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(golf) A golf club used for middle-distance shots.
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(uncountable, figurative) Used as a symbol of great strength or toughness, or to signify a very strong or tough material.
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(weightlifting) Weight used as resistance for the purpose of strength training.
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(countable, astronomy, geology) A meteorite consisting primarily of metallic iron (mixed with a small amount of nickel), as opposed to one composed mainly of stony material.
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A safety curtain in a theatre.
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(military, slang) Dumb bombs, those without guidance systems.