daystar UK /ˈdeɪstɑː/US /ˈdeɪstɑɹ/ noun2 •(literary) The Sun.I only go outdoors at night, away from the daystar's burning glare. •(literary) The planet Venus as the morning star.Here dawn'd the daystar of Hesperia's fame, / Here herald glory first emblazed her name — 1809 formsdaystars