Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. mĭnĭus, a, um, adj. [minium], of cinnabar or minium, cinnabar-red, vermilion (Appuleian): rosarum minius color, App. M. 4, p. 143, 3: circulus, id. Flor. 2, p. 348, 33.
2. Mĭnĭus, ii, m., a river in Lusitania, now the Minho, Mel. 3, 1, 8; Plin. 4, 20, 34, § 112; 4, 21, 35, § 115.