ire n.

c. 1300, from Old French errer "go astray, lose one's way; make a mistake; transgress," from Latin errare "wander, go astray," figuratively "be in error," from PIE root *ers- (1) "be in motion, wander around" (source also of Sanskrit arsati "flows;" Old English ierre "angry; straying;" Old Frisian ire "angry;" Old High German irri "angry," irron "astray;" Gothic airziþa "error; deception;" the Germanic words reflecting the notion of anger as a "straying" from normal composure). Related: Erred; erring.

Greek god of war in all its violence, brutality, confusion, and destruction; identified by Romans with their Mars, from Greek Arēs, literally "injurer, destroyer," from arē "bane, ruin," and perhaps cognate with Sanskrit irasya "ill-will" (see ire).