Noun ulcer has 1 sense
  1. 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