The Collaborative International Dictionary of English v.0.48:

Suppurate \Sup"pu*rate\, v. i. [imp. & p. p. Suppurated; p.
   pr. & vb. n. Suppurating.] [L. suppuratus, p. p. of
   suppurare to suppurate, cause to suppurate; sub under + pus,
   puris, matter. See Pus.]
   To generate pus; as, a boil or abscess suppurates.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Suppurate \Sup"pu*rate\, v. t.
   To cause to generate pus; as, to suppurate a sore.
   --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

suppurate
    v 1: cause to ripen and discharge pus; "The oil suppurates the
         pustules" [syn: suppurate, mature]
    2: ripen and generate pus; "her wounds are festering" [syn:
       fester, maturate, suppurate]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "suppurate":
   break up, canker, corrupt, crumble, crumble into dust, decay,
   decompose, disintegrate, fall into decay, fall to pieces, fester,
   gangrene, go bad, go to pieces, matter, mildew, mold, molder,
   mortify, necrose, putrefy, putresce, rankle, ripen, rot, run,
   sphacelate, spoil, weep