Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ŏrēon or ŏrīon, i, n., = ὄρειον, a mountain-plant, a kind of polygonos, Plin. 27, 12, 91, § 115
Ōrīon (Ŏrīōn, Verg. A. 1, 535; 4, 52), ŏnis and ōnis, m., = Ὠρίων, the constellation Orion, whose rising and setting are attended by storms; acc. to the myth, a hunter transported to heaven, Ov. F. 5, 493; Hyg. Fab. 195; Verg. A. 1, 535; 4, 52; Hor. C. 1, 28, 21; 3, 27, 18; Lact. 4, 5, 21 et saep.