The Collaborative International Dictionary of English v.0.48:
Sepsis \Sep"sis\, n. [NL., fr. Gr. ??? putrefaction.] (Med.) The poisoning of the system by the introduction of putrescent material into the blood. [1913 Webster]WordNet (r) 3.0 (2006):
sepsis n 1: the presence of pus-forming bacteria or their toxins in the blood or tissues