[fes.ter] n [ME, fr. MF festre, fr. L fistula pipe, fistulous ulcer] (14c): a suppurating sore: pustule
[2]fester vb fes.tered ; fes.ter.ing vi (14c) 1: to generate pus
2: putrefy, rot 3 a: to cause increasing poisoning, irritation, or bitterness: rankle "dissent ~ed unchecked" b: to undergo or exist in a state of progressive deterioration "allowed slums to ~" ~ vt: to make inflamed or corrupt