BEELZEBUB

Satan, Old Nick, Devil, Lucifer, Beelzebub, the Tempter, Prince of Darkness

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

Source: WordNet® 3.1

Be*el"ze*bub, n.

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition