Pronunciation: (fes'tur),[key] —v.i. 1. to form pus; generate purulent matter; suppurate.
2. to cause ulceration, as a foreign body in the flesh.
3. to putrefy or rot.
4. to rankle, as a feeling of resentment.
—v.t. to cause to rankle: Malice festered his spirit.
—n. 1. an ulcer; a rankling sore.
2. a small, purulent, superficial sore.