iron

(uncountable) A common, inexpensive metal, silvery grey when untarnished, that rusts, is attracted by magnets, and is used in making steel.

(uncountable, physics, chemistry, metallurgy) A metallic chemical element having atomic number 26 and symbol Fe.

(uncountable, countable, metallurgy) Any material, not a steel, predominantly made of elemental iron.

(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.

(usually plural, irons) shackles.

(slang) A firearm, either a long gun or a handgun.

(uncountable) A dark shade of the color silver.

(Cockney rhyming slang, shortened from iron hoof, rhyming with poof; countable, offensive) A male homosexual.

(golf) A golf club used for middle-distance shots.

(uncountable, figuratively) Used as a symbol of great strength or toughness, or to signify a very strong or tough material.

(weightlifting) Weight used as resistance for the purpose of strength training.

(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.

A safety curtain in a theatre.

(military, slang) dumb bombs, those without guidance systems.