[ noun ] (folklore) one of the evil spirits of traditional Jewish and Christian belief
Used in print(William G. Pollard, Physicist and Christian....)
Demons , fairies , angels , and a host of other spiritual_beings were as much a part of the experiential world of western man as were rocks and trees and stars .
For all involved in this discussion the devil is a real entity who can really be confronted in the woods on a dark night , the demon world is populated with real creatures , and witches actually can be seen flying through the air .(Clayton C. Barbeau, The Ikon....)
Clumps of brush that they passed were so many enchained demons straining in anger to tear and gnaw on his bones .
[ noun ] someone extremely diligent or skillful
"he worked like a demon to finish the job on time" "she's a demon at math"