Source : Webster's Revised Unabridged Dictionary (1913)

Sepsis \Sep"sis\, n. [NL., fr. Gr. ??? putrefaction.] (Med.)
   The poisoning of the system by the introduction of putrescent
   material into the blood.

Source : WordNet®

sepsis
     n : the presence of pus-forming bacteria or their toxins in the
         blood or tissues