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αἴθρα

τύμβος, ὦ νυμφεῖον, ὦ κατασκαφής οἴκησις αἰείφρουρος, οἷ πορεύομαι πρὸς τοὺς ἐμαυτῆς -> Tomb, bridal chamber, eternal prison in the caverned rock, whither I go to find mine own.
Sophocles, Antigone, 883

French (Bailly abrégé)

ας (ἡ) :
ciel pur, temps clair et serein.
Étymologie: αἴθω.

Dutch (Woordenboekgrieks.nl)

αἴθρα -ας, ἡ αἰθήρ heldere hemel.