What's the "een" in Halloween?
early 15c., from Middle French purulent and directly from Latin purulentus "full of pus," from pus (genitive puris) "pus" (see pus). Related: Purulence.
purulent pu·ru·lent (pyur'ə-lənt, pyur'yə-)adj. Containing, discharging, or causing the production of pus.