ἄας

Adv.
A. to-morrow or the day after to-morrow, gen. of ἄα, = ἠώς, read by Zenod. for ἠοῦς in Il. 8.470 (cf. Sch.Ven.); as Adv. in Boeot., Hsch.; cf. ἀές.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project