- ulcer, ulceration - a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue
--1 is a kind of lesion
--1 has particulars:aphthous ulcer; bedsore, pressure sore, decubitus ulcer; chancroid; peptic ulcer, peptic ulceration; canker; noli-me-tangere; noma Derived forms: verb ulcerate1, verb ulcerate2