"That feeds on dead bodies or decaying animal tissue; characterized by such behaviour", Mid 19th cent.; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From necro- + -phagous, after scientific Latin necrophagus from Hellenistic Greek νεκροϕάγος from νεκρο- + -ϕάγος.[necrophagous etymology, necrophagous origin, 英语词源]