of, pertaining to, or characteristic of Ireland, its inhabitants, or their language.

the inhabitants of Ireland and their descendants elsewhere.

the aboriginal Celtic-speaking people of Ireland.

Also called Irish Gaelic. the Celtic language of Ireland in its historical or modern form. Abbreviation

Ir, Ir. Compare Middle Irish Old Irish

Irish English.

Irish whiskey. ?

get one's Irish up

Informal . to become angry or outraged

Don't go getting your Irish up over a little matter like that.