The Collaborative International Dictionary of English v.0.48:

Purulent \Pu"ru*lent\, a. [L. purulentus, fr. pus, puris, pus,
   matter: cf. F. purulent. See Pus.] (Med.)
   Consisting of pus, or matter; partaking of the nature of pus;
   attended with suppuration; as, purulent inflammation.
   [1913 Webster]

WordNet (r) 3.0 (2006):

purulent
    adj 1: containing pus; "a purulent wound" [syn: purulent,
           pussy]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "purulent":
   bloody, chylifactive, chylifactory, chylific, festering, humoral,
   ichorous, lachrymal, lacrimatory, mattering, phlegmy, pussy,
   rankling, rheumy, sanious, serous, suppurated, suppurating,
   suppurative, tearlike