The Collaborative International Dictionary of English v.0.48:

Purulence \Pu"ru*lence\, Purulency \Pu"ru*len*cy\, n. [L.
   purulentia: cf. F. purulence.] (Med.)
   The quality or state of being purulent; the generation of
   pus; also, the pus itself. --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

purulence
    n 1: symptom of being purulent (containing or forming pus) [syn:
         purulence, purulency]
    2: a fluid product of inflammation [syn: pus, purulence,
       suppuration, ichor, sanies, festering]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "purulence":
   chyle, colostrum, discharge, festering, gleet, humor, ichor,
   lachryma, lactation, leukorrhea, lymph, matter, mattering, milk,
   mucor, mucus, peccant humor, phlegm, pus, rankling, rheum, running,
   saliva, sanies, serous fluid, serum, snot, suppuration, sweat,
   tear, teardrop, the whites, urine