rancid
rancid / rancid
Adjective
This term specifically describes the chemical breakdown of fats and oils, creating a sharp, pungent, and repulsive odor. It is most frequently applied to dairy products, nuts, or cooking oils that have oxidized over time. Beyond literal food spoilage, the word carries a strong connotation of corruption and filth. When used to describe non-food smells, it suggests a heavy, cloying scent of organic decay that is physically offensive to the senses.