Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Proetus, i, m., = Προῖτος, a king of Tiryns, brother of Acrisius, Ov. M. 5, 238 sq.
Proetĭdes, um, f., = Προιτιδες, his daughters, who being punished with madness by Juno for their pride, imagined themselves to be cows: Proetides implerunt falsis mugitibus agros, Verg. E. 6, 48; Ov. M. 15, 326; Plin. 25, 5, 21, § 47.