Added 10 October 2026 festering noun Categories: ActionsThe BodyRare Words noun ! Definition from WordNet 3.1, Princeton University. More about festering at Wordnik → Where our words come from → (medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus. A fluid product of inflammation. Related Words: purulentpurulencesuppurationsaniespusinfectedsepticichorpussyputriddeterioratingworsening Back to today's word