Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. ardĕa, ae, f. [kindred with the Gr. ἐρωδιός and ῤωδιός; cf. the Sanscr. rud = sonare], a heron (in Pliny usu. ardeola, q. v.), Verg. G. 1, 364.
2. Ardĕa, ae, f. [v. arduus], = Ἀρδέα, the capital of the Rutuli, six leagues south of Rome; acc. to the myth, it was burned by Æneas, and from its ashes the heron (ardea) was produced, Ov. M. 14, 573; Verg A. 7, 411; cf. Serv. ad h. l.; Mann. Ital. I. 617; Müll. Roms Camp. 2, 296-312.
Hence, Derivv.,