A.clear, bright, of weather, “αἰθρίου ἐόντος τοῦ ἠέρος” Hdt. 2.25; αἴ. πάγος clear frost, S.Fr.149; f.l. in Ant.357.
2. epith. of Ζεύς, Heraclit. 120, Theoc.4.43, cf. Arist.Mu.401a17, Thphr.CP5.12.2; of winds which cause a clear sky, h. Ap.433, Arist.Mete.364b29; esp. of the North wind, ib. 358b1.
II. kept in the open air, “στέφη” Cratin.22.
III. αἴθριον , τό, adaptation of Lat. atrium to a Greek sense, J.AJ3.6.2, Luc.Anach.2, POxy.268.22 (i A. D.), etc.