The Collaborative International Dictionary of English v.0.48:

Ulcerous \Ul"cer*ous\, a. [L. ulcerosus: cf. F. ulc['e]reux.]
   1. Having the nature or character of an ulcer; discharging
      purulent or other matter. --R. Browning.
      [1913 Webster]

   2. Affected with an ulcer or ulcers; ulcerated.
      [1913 Webster]

            It will but skin and film the ulcerous place.
                                                  --Shak.
      [1913 Webster] -- Ul"cer*ous*ly, adv. --
      Ul"cer*ous*ness, n.
      [1913 Webster] Ulcuscle

WordNet (r) 3.0 (2006):

ulcerous
    adj 1: having an ulcer or canker [syn: cankerous, ulcerated,
           ulcerous]