The Collaborative International Dictionary of English v.0.48:

Ulcerate \Ul"cer*ate\, v. i. [imp. & p. p. Ulcerated; p. pr. &
   vb. n. Ulcerating.] [L. ulceratus, p. p. of ulcerare, fr.
   ulcus ulcer.]
   To be formed into an ulcer; to become ulcerous.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ulcerate \Ul"cer*ate\, v. t.
   To affect with, or as with, an ulcer or ulcers. --Harvey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ulcerate
    v 1: undergo ulceration; "Her stomach ulcerated"
    2: affect with an ulcer; "Her stomach was ulcerated"