Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Rhēa, ae, f., an old Italian name. Thus, Rhea Silvia, daughter of Numitor and mother of Romulus and Remus, Liv. 1, 3; Flor. 1, 1, 1; Prud. adv. Symm. 1, 174 (cf. Verg. A. 1, 276).
Hence comes the name of the fabled priestess Rhea in Verg. A. 7, 659.
2. Rhĕa, ae, f., = Ῥέα, another name for Cybele, Ov. F. 4, 201: Rhea, quae Latiis Ops, Aus. Idyll. 12 de Deis, 2.