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]