noun (n)

• (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell(noun.person)

  Synonym:
  devil, lucifer, old nick, prince of darkness, satan, the tempter
  

  source: wordnet30
• The title of a heathen deity to whom the Jews ascribed the sovereignty of the evil spirits; hence, the Devil or a devil. See Baal.(noun)

  source: webster1913