(golf) An iron golf club which can be used as a driver.

(golf) An iron golf club with more lift than a driver.

plural of iron horse

(transport) A railroad steam locomotive.

(intransitive) To use a sadiron. / (transitive) To press with a sadiron.

(computing, slang, humorous, dated) Large, expensive, powerful computers such as mainframes.

plural of irrational number

The official name of the United Kingdom 1801-1927 (before being renamed by the Royal and Parliamentary Titles Act 1927 following the creation of the Irish Free State in 1922).

The Goidelic language spoken in Ireland, Scotland, and the Isle of Man from the 10th to the 12th century.

Used other than figuratively or idiomatically: see Great Britain, Ireland: two islands off the north-west coast of the European mainland.