Liddell-Scott-Jones

σῆψις (sēpsis) putrefaction ^G:N-F

σῆψις,

Doric dialect σᾶψις, εως, ἡ, (σήπομαι) fermentation, putrefaction, decay, αὐχμηραί τε νόσοι καὶ σήψιες [Refs 5th c.BC+]

__II (σήπω) the process by which the intestines reject that part of food which is not nutritious, opposed to πέψις, [Refs 4th c.BC+]