Part of speech: Noun
a planet (usually Venus) seen just before sunrise in the eastern sky
Lucifer, Morning star, Phosphorus, Daystar
The word "daystar" comes from Old English dæġsteorra, which comes from Middle English daysterre. Many other languages have similar words:
day – A related word in the same word family.
star – A related word in the same word family.
Many Old English words vanished after the Norman Conquest, replaced by French equivalents.