noun
Medical term for a localized collection of pus in a tissue cavity.
歯の根元に膿瘍ができた。
An abscess formed at the base of the tooth.
腫れ物 is a general term for a swelling or boil, while 膿瘍 specifically refers to a pus-filled abscess in medical contexts.
The kanji 膿 means 'pus' and 瘍 means 'ulcer' or 'sore', together forming the medical term for abscess. The reading is on'yomi.