sup·pu·rate 
(sŭpyə-rāt′)
(sŭpyə-rāt′)intr.v. sup·pu·rat·ed, sup·pu·rat·ing, sup·pu·rates
To form or discharge pus.
[Middle English suppuraten, from Latin suppūrāre, suppūrāt- : sub-, sub- + pūs, pūr-, pus; see p- in the Appendix of Indo-European roots.]