/ ˈdiːmən; NAmE / noun
1.
an evil spirit :
demons torturing the sinners in Hell
2.
( informal ) a person who does sth very well or with a lot of energy :
He skis like a demon.
3.
something that causes a person to worry and makes them unhappy :
the demons of jealousy
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IDIOMS
- the demon drink
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WORD ORIGIN
Middle English : from medieval Latin , from Latin daemon , from Greek daimōn deity, genius; in sense 1 also from Latin daemonium lesser or evil spirit, from Greek daemonion , diminutive of daimōn .