pu·ru·lent 
(pyrə-lənt, pyryə-)
(pyrə-lənt, pyryə-)adj.
Containing, discharging, or causing the production of pus: a purulent infection.
[Middle English purulente, from Old French purulent, from Latin pūrulentus, from pūs, pūr-, pus; see p- in the Appendix of Indo-European roots.]
puru·lent·ly adv.