- The study of demons.
- Belief in demons.
- A list or catalog of one's enemies: “As the years passed [the magazine's] demonology expanded to include Bolsheviks, radicals, Franklin D. Roosevelt, the New Deal, Government work programs or aid programs of any kind” ( Maggie Nichols )
- de′mon·o·log′ic de′mon·o·log′i·cal
From demon + -logy.