simple past tense and past participle of ire

Used for expressing negation; not

(obsolete) Iron.

Great anger; wrath; keen resentment.

(transitive, rare) To anger, to irritate.

(business) Initialism of industrial relations. / (business) Initialism of investor relations. / (computer science) Initialism of information retrieval. / (physics) Abbreviation of infrared.

(US): Initialism of Internal Revenue Service.

(aviation) Initialism of inertial reference system. / (engineering) Initialism of Interface Requirements Specification.

(finance) Initialism of interest rate swap.

The state of being ireful; anger; fury.