The Greek word αργέστης
Word αργέστης
a r ɟ e. s t ɛː ς
IPA arɟe.stɛːς
Meaning shining, brilliant, white, bright
See also Phrygian: ΑΡΕJΑΣΤΙΝ ‘epithet of the great mother’
Proto-Indo-European: *ar(e)-ĝ- ‘glittering, bright, white, fast’
Ancient Macedonian: Αργεσταίος ‘ethnonym’
Greek: ἀργηστής ‘glancing, flashing, white’
Hittite: ḫar-ki-iš ‘white, bright’
Synonyms αγλαός, άργιος

Other words that might be of interest
μέλας ‘black, dark’, κελαινός ‘black, dark’, φαίνω ‘bring to light, shine, reveal’, φάος ‘light’, πῦρ ‘fire’, δάος ‘light, flame, torch’, έρεβος ‘darkness’