Webster's Revised Unabridged Dictionary · 1913

Fester

Fester , intransitive verb

[Old English festern, from fester, n.; or fr. OF. festrir, from festre, n. See Fester, n.]

1.
To generate pus; to become imflamed and suppurate; as, a sore or a wound festers.
Wounds immedicable Rankle, and fester, and gangrene. — Milton
Unkindness may give a wound that shall bleed and smart, but it is treachery that makes it fester. — South
Hatred... festered in the hearts of the children of the soil. — Macaulay
2.
To be inflamed; to grow virulent, or malignant; to grow in intensity; to rankle.

Fester , transitive verb

To cause to fester or rankle.
For which I burnt in inward, swelt'ring hate, And festered ranking malice in my breast. — Marston

Fester , noun

[Old French festre, Latin fistula a sort of ulcer. Compare Fistula.]

1.
A small sore which becomes inflamed and discharges corrupt matter; a pustule.
2.
A festering or rankling.
The fester of the chain their necks. — I. Taylor