Definition of demon

< demolition derby

demon. >

de·mon    (dmn) KEY 

NOUN:

1. An evil supernatural being; a devil.
2. A persistently tormenting person, force, or passion: the demon of drug addiction.
3. One who is extremely zealous, skillful, or diligent: worked away like a demon; a real demon at math.
4. Variant of daimon.

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ETYMOLOGY:
Middle English, from Late Latin daemn, from Latin, spirit, from Greek daimn, divine power; see d- in Indo-European roots