Stench (noun)

1. A strong, offensive smell.
2. An unpleasant or foul odor.

Origin:

Middle english (in the sense "a strong smell, an odor"): from old english stenċ, of germanic origin; related to dutch stank and german gestank.

Examples:

1. The stench from the garbage was overwhelming.
2. The stench of rotting fish filled the air.
3. The stench of the city's sewage system was unbearable.
4. The smell of the rotting food was a stench.
5. The stench of the chemicals was making him sick.