Lucifer (lû'si-fer), light-bringer. The original word signifies brilliant star, i.e., the morning star. The title is applied to the king of Babylon in Isaiah 14:12, R. V., day star; he had outshone other kings, as the bright star of the morning surpasses other stars. Falling from heaven denotes a sudden political overthrow or catastrophe. In popular language Lucifer is regarded as an appellation of Satan.