ἀνταυγής
From LSJ
τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
English (LSJ)
ές,
A reflecting light, sparkling, κάλλος Sannyr.1D.; κόραι Ar.Th.902; χιών D.S.17.82: pr. n. Ἀνταύγης, of the sun, Orph.Fr.237.