Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ŏrēăs, ădis, f., = Ὀρειάς, a mountainnymph, Oread (poet.): quam mille secutae Hinc atque hinc glomerantur Oreades, Verg. A. 1, 500; Ov. M. 8, 787; Calp. Ecl. 4, 136; cf. Oreos.