Strong’s Greek
G5459 — phosphoros
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
φωσφόρος
phosphoros — pronounced foce-for'-os
from 5457 and 5342; light-bearing ("phosphorus"), i.e. (specially), the morning-star (figuratively):--day star. see GREEK for 5457 see GREEK for 5342
1 occurrence in the KJV.
2 Peter 1:19
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 arise in your hearts: