[φωσφόρος] from G5457 and G5342; light-bearing ("phosphorus"), i.e. (specially), the morning-star (figuratively)
Usages throughout the bible
2 Peter 1:19
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We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star G5459 arise in your hearts: