GNU Collaborative International Dictionary of English

Found one definition

1.       
   Demon , n. [F. démon, L. daemon a spirit, an evil spirit, fr. Gr. δαίμων a divinity; of uncertain origin.]
   (Gr. Antiq.) A spirit, or immaterial being, holding a middle place between men and deities in pagan mythology.
   1913 Webster
   The demon kind is of an intermediate nature between the divine and the human.
   Sydenham.
   
   1913 Webster
   One's genius; a tutelary spirit or internal voice; as, the demon of Socrates. [Often written dæmon.]
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   An evil spirit; a devil.
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   That same demon that hath gulled thee thus.
   Shak.
   
   1913 Webster