Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Astraea, ae, f., = Ἀστραία, the goddess of Justice, who, during the Golden Age, lived on the earth, but finally abandoned it, and returned to heaven, Ov. M. 1, 150; Juv. 6, 19; Sen. Oct. 424; cf.: Jam redit et Virgo, i.e. Astraea, Verg. E. 4, 6.
As a constellation, Libra; acc. to others, Virgo, Luc. 9, 534; cf. Arat. Phaen. 98.