A post mortem examination is a medical procedure that is conducted in order to determine the cause of death of a person. There are several synonyms for this term, including autopsy, necropsy, and post-mortem investigation. The word autopsy comes from the Greek word "autopsia," which means "to see with one's own eyes." Necropsy, on the other hand, is derived from the Greek word "nekros," which means "dead body." Post-mortem investigation is a less commonly used term, but it is still a synonym for the procedure. Regardless of which term is used, a post mortem examination is an important process that provides valuable information about the cause of death.