An act of irradiating, or state of being irradiated. / (obsolete) illumination; irradiance; brilliance. / (obsolete, figuratively) mental light or illumination.

Easily provoked to outbursts of anger; irritable.

(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).

(chiefly Britain, Ireland) A retailer in iron goods and hardware.

(Ireland, UK, politics) Initialism of Irish Republican Army. / (Internet, politics) Initialism of Internet Research Agency. / (US politics) Initialism of Inflation Reduction Act.

(US, finance) Initialism of individual retirement account.

(transitive) to irritate; annoy; bother