1. The study of fecal excrement or feces, as in medicine, paleontology, or biology.
2. The scientific study and analysis of the feces.
3. Interest in obscene things; especially, obscene literature and conversation.

Scatology derives from a Greek word meaning "dung knowledge" and is used in pathology to mean "diagnosis by a study of feces."

It is commonly applied today; such as, to obscene or bawdy literature, some radio "talk shows" and TV programs, films, and dramatic performances.