adjective
putrid
PYOO-trid/ˈpjuːtrɪd/
Foul-smelling from decay.
A putrid smell rises from the fish left in the trash.

Etymology
Latin putridus belongs to a family connecting rotting with stinking. The selected meaning keeps those ideas together: the foul smell is associated with material in a state of decay.
In context
There was a putrid smell of dead horses and mules.
More examples
- We threw away the putrid meat before cooking dinner.
- The bucket of stagnant water smells putrid.
- A putrid odor led us to a dead mouse behind the refrigerator.
Forms
putrid
putridity noun — The state of being rotten and foul-smelling.