BIBLE DICTIONARY
Lucifer

Literally the Shining One; also Lightbringer or Son of the Morning. Lucifer is also known as Satan or the devil. The name Lucifer appears only once in the Bible (Isa. 14: 12, but cf. Luke 10: 18). Apparently Lucifer is the name of the devil before his rebellion and fall. Latter-day revelation clarifies the fall of Lucifer and equates him with Satan (D&C 76: 25-38; cf. Rev. 12: 1-17; 2 Ne. 9: 8; D&C 29: 36-38; Moses 4: 1-4).