- to kill
or murder evil
Example: When the priest killed the evil spirit he committed malecide.
This word, and concept has been used in more literal terms to justify the killing of others in the name of religion -- since homicide is a sin, but malecide is not.
Source: The Templars: The Dramatic History of the Knights Templar, the Most Powerful Military Order of the Crusades, by Piers Paul Read