Putrefaction

[Dave Paprocki]

The act or the process of putrefying; the offensive
decay of albuminous or other matter.

[Hina Muqadas]

Decomposition of [organic] matter, especially [protein], by microorganisms, resulting in production of foul-smelling matter.
Putrefied matter.
[The condition] of being putrefied.

[Dianne]

the state of decaying