Ire, n.
Etymology: [F., fr. L. ira.]
Anger; wrath. [Poet.]
Syn. -- Anger; passion; rage; fury. See Anger.
Shades of meaning
Fernald has no entry of its own for ire; he lists it under anger.
Where he writes about it:
Choler and ire, now rare except in poetic or highly rhetorical language, denote a still, and the latter a persistent, anger. — from anger