Concise Bible Dictionary:
The word is from θῶς and θέρω, “to bring light” (2 Pet. 1:19). Prophecy is a light in this dark world respecting things here and judgment. But, in contrast to judgment, the dawn and the day star are a better hope, not seen by those who appear only when the sun is risen, but for saints who look for Christ before He appears.
Strong’s Dictionary of Greek Words:
Transliteration:
phosphoros
Meaning:
from 5457 and 5342; light-bearing ("phosphorus"), i.e. (specially), the morning-star (figuratively)