Definition of festers:
(v) :
(intransitive) To become septic; to become rotten.
(v) :
(intransitive) To worsen, especially due to lack of attention.
(v) :
(transitive) To cause to fester or rankle.
(n) :
(pathology) A sore or an ulcer of the skin.
(n) :
The condition of something that festers; a festering; a festerment.
(n) :
(pathology, obsolete) A fistula.