Source : Webster's Revised Unabridged Dictionary (1913)

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.