A particular allotrope of iron.

Alternative spelling of flatiron

(nautical) A tool somewhat like a chisel with a groove in it, used by caulkers of ships to finish the seams after the oakum has been driven in.

(Cockney rhyming slang) A poof (a male homosexual).

A piece of metal bent into a distinctive shape, heated and used to brand livestock.

(transitive) To remove (a crease or creases) with an iron. / (transitive, figuratively) To resolve (a dispute); to solve (a problem).

(mythology) The most recent and debased of the four or five classical Ages of Man; hence, any period characterized by wicked behavior. / An age characterized by the use of iron.

A type of crude, brittle iron shaped like a block, unsuitable for working but suitable for casting, commonly used as an industrial raw material.

A pneumonic device for assisted breathing.

(Ireland, endearing slang) Northern Ireland.