[1] : The Collaborative International Dictionary of English v.0.48

ulceration \ul`cera"tion\, n. l. ulceratio: cf. f.
   ulc'eration. med.
   the process of forming an ulcer, or of becoming ulcerous; the
   state of being ulcerated; also, an ulcer.
   1913 webster

[2] : WordNet (r) 2.0

ulceration
     n 1: a circumscribed inflammatory and often suppurating lesion on
          the skin or an internal mucous surface resulting in
          necrosis of tissue syn: ulcer
     2: the process of ulcer formation; the process of becoming
        ulcerated
see also:
ulcer 

Ulceration >> U Words
Ulceration, definition of term: Ulceration
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